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RCDoubleMatrix2D (Colt 1.2.0 - API Specification)
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cern.colt.matrix.impl</FONT>
<BR>
Class RCDoubleMatrix2D</H2>
<PRE>
<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">java.lang.Object</A>
  <IMG SRC="../../../../resources/inherit.gif" ALT="extended by"><A HREF="../../../../cern/colt/PersistentObject.html" title="class in cern.colt">cern.colt.PersistentObject</A>
      <IMG SRC="../../../../resources/inherit.gif" ALT="extended by"><A HREF="../../../../cern/colt/matrix/impl/AbstractMatrix.html" title="class in cern.colt.matrix.impl">cern.colt.matrix.impl.AbstractMatrix</A>
          <IMG SRC="../../../../resources/inherit.gif" ALT="extended by"><A HREF="../../../../cern/colt/matrix/impl/AbstractMatrix2D.html" title="class in cern.colt.matrix.impl">cern.colt.matrix.impl.AbstractMatrix2D</A>
              <IMG SRC="../../../../resources/inherit.gif" ALT="extended by"><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">cern.colt.matrix.DoubleMatrix2D</A>
                  <IMG SRC="../../../../resources/inherit.gif" ALT="extended by">cern.colt.matrix.impl.WrapperDoubleMatrix2D
                      <IMG SRC="../../../../resources/inherit.gif" ALT="extended by"><B>cern.colt.matrix.impl.RCDoubleMatrix2D</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Cloneable.html" title="class or interface in java.lang">Cloneable</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/Serializable.html" title="class or interface in java.io">Serializable</A></DD>
</DL>
<HR>
<DL>
<DT>public class <B>RCDoubleMatrix2D</B><DT>extends cern.colt.matrix.impl.WrapperDoubleMatrix2D</DL>

<P>
Sparse row-compressed 2-d matrix holding <tt>double</tt> elements.
First see the <a href="package-summary.html">package summary</a> and javadoc <a href="package-tree.html">tree view</a> to get the broad picture.
<p>
<b>Implementation:</b>
<p>
Internally uses the standard sparse row-compressed format, with two important differences that broaden the applicability of this storage format:
<ul>
<li>We use a <A HREF="../../../../cern/colt/list/IntArrayList.html" title="class in cern.colt.list"><CODE>IntArrayList</CODE></A> and <A HREF="../../../../cern/colt/list/DoubleArrayList.html" title="class in cern.colt.list"><CODE>DoubleArrayList</CODE></A> to hold the column indexes and nonzero values, respectively. 
This improves set(...) performance, because the standard way of using non-resizable primitive arrays causes excessive memory allocation, garbage collection and array copying.
The small downside of this is that set(...,0) does not free memory (The capacity of an arraylist does not shrink upon element removal).
<li>Column indexes are kept sorted within a row. This both improves get and set performance on rows with many non-zeros, because we can use a binary search. 
(Experiments show that this hurts < 10% on rows with < 4 nonZeros.)
</ul>
<br>
Note that this implementation is not synchronized.
<p>
<b>Memory requirements:</b>
<p>
Cells that
<ul>
<li>are never set to non-zero values do not use any memory.
<li>switch from zero to non-zero state do use memory.
<li>switch back from non-zero to zero state also do use memory. Their memory is <i>not</i> automatically reclaimed (because of the lists vs. arrays). Reclamation can be triggered via <A HREF="../../../../cern/colt/matrix/impl/RCDoubleMatrix2D.html#trimToSize()"><CODE>trimToSize()</CODE></A>.
</ul>
<p>
<tt>memory [bytes] = 4*rows + 12 * nonZeros</tt>.
<br>Where <tt>nonZeros = cardinality()</tt> is the number of non-zero cells.
Thus, a 1000 x 1000 matrix with 1000000 non-zero cells consumes 11.5 MB.
The same 1000 x 1000 matrix with 1000 non-zero cells consumes 15 KB.
<p>
<b>Time complexity:</b>
<p>
Getting a cell value takes time<tt> O(log nzr)</tt> where <tt>nzr</tt> 
  is the number of non-zeros of the touched row. This is usually quick, because 
  typically there are only few nonzeros per row. So, in practice, get has <i>expected</i> 
  constant time. Setting a cell value takes <i> </i>worst-case time <tt>O(nz)</tt> 
  where <tt>nzr</tt> is the total number of non-zeros in the matrix. This can 
  be extremely slow, but if you traverse coordinates properly (i.e. upwards), each write is done much quicker:
<table>
<td class="PRE"> 
<pre>
// rather quick
matrix.assign(0);
for (int row=0; row < rows; row++) {
&nbsp;&nbsp;&nbsp;for (int column=0; column < columns; column++) {
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (someCondition) matrix.setQuick(row,column,someValue);
&nbsp;&nbsp;&nbsp;}
}

// poor
matrix.assign(0);
for (int row=rows; --row >= 0; ) {
&nbsp;&nbsp;&nbsp;for (int column=columns; --column >= 0; ) {
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (someCondition) matrix.setQuick(row,column,someValue);
&nbsp;&nbsp;&nbsp;}
}
</pre>
</td>
</table>
If for whatever reasons you can't iterate properly, consider to create an empty dense matrix, store your non-zeros in it, then call <tt>sparse.assign(dense)</tt>. Under the circumstances, this is still rather quick.
<p>
Fast iteration over non-zeros can be done via <A HREF="../../../../cern/colt/matrix/impl/RCDoubleMatrix2D.html#forEachNonZero(cern.colt.function.IntIntDoubleFunction)"><CODE>forEachNonZero(cern.colt.function.IntIntDoubleFunction)</CODE></A>, which supplies your function with row, column and value of each nonzero.
Although the internally implemented version is a bit more sophisticated,
here is how a quite efficient user-level matrix-vector multiplication could look like:
<table>
<td class="PRE"> 
<pre>
// Linear algebraic y = A * x
A.forEachNonZero(
&nbsp;&nbsp;&nbsp;new cern.colt.function.IntIntDoubleFunction() {
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;public double apply(int row, int column, double value) {
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;y.setQuick(row,y.getQuick(row) + value * x.getQuick(column));
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return value;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}
&nbsp;&nbsp;&nbsp;}
);
</pre>
</td>
</table>
<p>
Here is how a a quite efficient user-level combined scaling operation could look like:
<table>
<td class="PRE"> 
<pre>
// Elementwise A = A + alpha*B
B.forEachNonZero(
&nbsp;&nbsp;&nbsp;new cern.colt.function.IntIntDoubleFunction() {
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;public double apply(int row, int column, double value) {
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A.setQuick(row,column,A.getQuick(row,column) + alpha*value);
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return value;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}
&nbsp;&nbsp;&nbsp;}
);
</pre>
</td>
</table>
Method <A HREF="../../../../cern/colt/matrix/impl/RCDoubleMatrix2D.html#assign(cern.colt.matrix.DoubleMatrix2D, cern.colt.function.DoubleDoubleFunction)"><CODE>assign(DoubleMatrix2D,cern.colt.function.DoubleDoubleFunction)</CODE></A> does just that if you supply <A HREF="../../../../cern/jet/math/Functions.html#plusMult(double)"><CODE>Functions.plusMult(double)</CODE></A> as argument.
<P>

<P>
<DL>
<DT><B>Version:</B></DT>
  <DD>0.9, 04/14/2000</DD>
<DT><B>See Also:</B><DD><A HREF="../../../../serialized-form.html#cern.colt.matrix.impl.RCDoubleMatrix2D">Serialized Form</A></DL>
<HR>

<P>
<!-- ======== NESTED CLASS SUMMARY ======== -->


<!-- =========== FIELD SUMMARY =========== -->

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&nbsp;
<!-- ======== CONSTRUCTOR SUMMARY ======== -->

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<TD COLSPAN=2><FONT SIZE="+2">
<B>Constructor Summary</B></FONT></TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../cern/colt/matrix/impl/RCDoubleMatrix2D.html#RCDoubleMatrix2D(double[][])">RCDoubleMatrix2D</A></B>(double[][]&nbsp;values)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Constructs a matrix with a copy of the given values.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../cern/colt/matrix/impl/RCDoubleMatrix2D.html#RCDoubleMatrix2D(int, int)">RCDoubleMatrix2D</A></B>(int&nbsp;rows,
                 int&nbsp;columns)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Constructs a matrix with a given number of rows and columns.</TD>
</TR>
</TABLE>
&nbsp;
<!-- ========== METHOD SUMMARY =========== -->

<A NAME="method_summary"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TD COLSPAN=2><FONT SIZE="+2">
<B>Method Summary</B></FONT></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../cern/colt/matrix/impl/RCDoubleMatrix2D.html#assign(double)">assign</A></B>(double&nbsp;value)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sets all cells to the state specified by <tt>value</tt>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../cern/colt/matrix/impl/RCDoubleMatrix2D.html#assign(cern.colt.function.DoubleFunction)">assign</A></B>(<A HREF="../../../../cern/colt/function/DoubleFunction.html" title="interface in cern.colt.function">DoubleFunction</A>&nbsp;function)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Assigns the result of a function to each cell; <tt>x[row,col] = function(x[row,col])</tt>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../cern/colt/matrix/impl/RCDoubleMatrix2D.html#assign(cern.colt.matrix.DoubleMatrix2D)">assign</A></B>(<A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A>&nbsp;source)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Replaces all cell values of the receiver with the values of another matrix.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../cern/colt/matrix/impl/RCDoubleMatrix2D.html#assign(cern.colt.matrix.DoubleMatrix2D, cern.colt.function.DoubleDoubleFunction)">assign</A></B>(<A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A>&nbsp;y,
       <A HREF="../../../../cern/colt/function/DoubleDoubleFunction.html" title="interface in cern.colt.function">DoubleDoubleFunction</A>&nbsp;function)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Assigns the result of a function to each cell; <tt>x[row,col] = function(x[row,col],y[row,col])</tt>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../cern/colt/matrix/impl/RCDoubleMatrix2D.html#forEachNonZero(cern.colt.function.IntIntDoubleFunction)">forEachNonZero</A></B>(<A HREF="../../../../cern/colt/function/IntIntDoubleFunction.html" title="interface in cern.colt.function">IntIntDoubleFunction</A>&nbsp;function)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Assigns the result of a function to each <i>non-zero</i> cell; <tt>x[row,col] = function(x[row,col])</tt>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;double</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../cern/colt/matrix/impl/RCDoubleMatrix2D.html#getQuick(int, int)">getQuick</A></B>(int&nbsp;row,
         int&nbsp;column)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the matrix cell value at coordinate <tt>[row,column]</tt>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../cern/colt/matrix/impl/RCDoubleMatrix2D.html#like(int, int)">like</A></B>(int&nbsp;rows,
     int&nbsp;columns)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Construct and returns a new empty matrix <i>of the same dynamic type</i> as the receiver, having the specified number of rows and columns.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html" title="class in cern.colt.matrix">DoubleMatrix1D</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../cern/colt/matrix/impl/RCDoubleMatrix2D.html#like1D(int)">like1D</A></B>(int&nbsp;size)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Construct and returns a new 1-d matrix <i>of the corresponding dynamic type</i>, entirelly independent of the receiver.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../cern/colt/matrix/impl/RCDoubleMatrix2D.html#setQuick(int, int, double)">setQuick</A></B>(int&nbsp;row,
         int&nbsp;column,
         double&nbsp;value)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sets the matrix cell at coordinate <tt>[row,column]</tt> to the specified value.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../cern/colt/matrix/impl/RCDoubleMatrix2D.html#trimToSize()">trimToSize</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Releases any superfluous internal memory.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html" title="class in cern.colt.matrix">DoubleMatrix1D</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../cern/colt/matrix/impl/RCDoubleMatrix2D.html#viewColumn(int)">viewColumn</A></B>(int&nbsp;column)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Constructs and returns a new <i>slice view</i> representing the rows of the given column.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../cern/colt/matrix/impl/RCDoubleMatrix2D.html#viewColumnFlip()">viewColumnFlip</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Constructs and returns a new <i>flip view</i> along the column axis.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../cern/colt/matrix/impl/RCDoubleMatrix2D.html#viewDice()">viewDice</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Constructs and returns a new <i>dice (transposition) view</i>; Swaps axes; example: 3 x 4 matrix --> 4 x 3 matrix.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../cern/colt/matrix/impl/RCDoubleMatrix2D.html#viewPart(int, int, int, int)">viewPart</A></B>(int&nbsp;row,
         int&nbsp;column,
         int&nbsp;height,
         int&nbsp;width)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Constructs and returns a new <i>sub-range view</i> that is a <tt>height x width</tt> sub matrix starting at <tt>[row,column]</tt>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html" title="class in cern.colt.matrix">DoubleMatrix1D</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../cern/colt/matrix/impl/RCDoubleMatrix2D.html#viewRow(int)">viewRow</A></B>(int&nbsp;row)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Constructs and returns a new <i>slice view</i> representing the columns of the given row.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../cern/colt/matrix/impl/RCDoubleMatrix2D.html#viewRowFlip()">viewRowFlip</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Constructs and returns a new <i>flip view</i> along the row axis.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../cern/colt/matrix/impl/RCDoubleMatrix2D.html#viewSelection(int[], int[])">viewSelection</A></B>(int[]&nbsp;rowIndexes,
              int[]&nbsp;columnIndexes)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Constructs and returns a new <i>selection view</i> that is a matrix holding the indicated cells.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../cern/colt/matrix/impl/RCDoubleMatrix2D.html#viewStrides(int, int)">viewStrides</A></B>(int&nbsp;_rowStride,
            int&nbsp;_columnStride)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Constructs and returns a new <i>stride view</i> which is a sub matrix consisting of every i-th cell.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html" title="class in cern.colt.matrix">DoubleMatrix1D</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../cern/colt/matrix/impl/RCDoubleMatrix2D.html#zMult(cern.colt.matrix.DoubleMatrix1D, cern.colt.matrix.DoubleMatrix1D, double, double, boolean)">zMult</A></B>(<A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html" title="class in cern.colt.matrix">DoubleMatrix1D</A>&nbsp;y,
      <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html" title="class in cern.colt.matrix">DoubleMatrix1D</A>&nbsp;z,
      double&nbsp;alpha,
      double&nbsp;beta,
      boolean&nbsp;transposeA)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Linear algebraic matrix-vector multiplication; <tt>z = alpha * A * y + beta*z</tt>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../cern/colt/matrix/impl/RCDoubleMatrix2D.html#zMult(cern.colt.matrix.DoubleMatrix2D, cern.colt.matrix.DoubleMatrix2D, double, double, boolean, boolean)">zMult</A></B>(<A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A>&nbsp;B,
      <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A>&nbsp;C,
      double&nbsp;alpha,
      double&nbsp;beta,
      boolean&nbsp;transposeA,
      boolean&nbsp;transposeB)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Linear algebraic matrix-matrix multiplication; <tt>C = alpha * A x B + beta*C</tt>.</TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_cern.colt.matrix.DoubleMatrix2D"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TD><B>Methods inherited from class cern.colt.matrix.<A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></B></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#aggregate(cern.colt.function.DoubleDoubleFunction, cern.colt.function.DoubleFunction)">aggregate</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#aggregate(cern.colt.matrix.DoubleMatrix2D, cern.colt.function.DoubleDoubleFunction, cern.colt.function.DoubleDoubleFunction)">aggregate</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#assign(double[][])">assign</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#cardinality()">cardinality</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#copy()">copy</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#equals(double)">equals</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#equals(java.lang.Object)">equals</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#get(int, int)">get</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#getNonZeros(cern.colt.list.IntArrayList, cern.colt.list.IntArrayList, cern.colt.list.DoubleArrayList)">getNonZeros</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#like()">like</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#set(int, int, double)">set</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#toArray()">toArray</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#toString()">toString</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#viewSelection(cern.colt.matrix.DoubleMatrix1DProcedure)">viewSelection</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#viewSorted(int)">viewSorted</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#zAssign8Neighbors(cern.colt.matrix.DoubleMatrix2D, cern.colt.function.Double9Function)">zAssign8Neighbors</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#zMult(cern.colt.matrix.DoubleMatrix1D, cern.colt.matrix.DoubleMatrix1D)">zMult</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#zMult(cern.colt.matrix.DoubleMatrix2D, cern.colt.matrix.DoubleMatrix2D)">zMult</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#zSum()">zSum</A></CODE></TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_cern.colt.matrix.impl.AbstractMatrix2D"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TD><B>Methods inherited from class cern.colt.matrix.impl.<A HREF="../../../../cern/colt/matrix/impl/AbstractMatrix2D.html" title="class in cern.colt.matrix.impl">AbstractMatrix2D</A></B></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../cern/colt/matrix/impl/AbstractMatrix2D.html#checkShape(cern.colt.matrix.impl.AbstractMatrix2D)">checkShape</A>, <A HREF="../../../../cern/colt/matrix/impl/AbstractMatrix2D.html#checkShape(cern.colt.matrix.impl.AbstractMatrix2D, cern.colt.matrix.impl.AbstractMatrix2D)">checkShape</A>, <A HREF="../../../../cern/colt/matrix/impl/AbstractMatrix2D.html#columns()">columns</A>, <A HREF="../../../../cern/colt/matrix/impl/AbstractMatrix2D.html#rows()">rows</A>, <A HREF="../../../../cern/colt/matrix/impl/AbstractMatrix2D.html#size()">size</A>, <A HREF="../../../../cern/colt/matrix/impl/AbstractMatrix2D.html#toStringShort()">toStringShort</A></CODE></TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_cern.colt.matrix.impl.AbstractMatrix"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TD><B>Methods inherited from class cern.colt.matrix.impl.<A HREF="../../../../cern/colt/matrix/impl/AbstractMatrix.html" title="class in cern.colt.matrix.impl">AbstractMatrix</A></B></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../cern/colt/matrix/impl/AbstractMatrix.html#ensureCapacity(int)">ensureCapacity</A></CODE></TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_cern.colt.PersistentObject"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TD><B>Methods inherited from class cern.colt.<A HREF="../../../../cern/colt/PersistentObject.html" title="class in cern.colt">PersistentObject</A></B></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../cern/colt/PersistentObject.html#clone()">clone</A></CODE></TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TD><B>Methods inherited from class java.lang.<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></B></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
</TR>
</TABLE>
&nbsp;
<P>

<!-- ============ FIELD DETAIL =========== -->


<!-- ========= CONSTRUCTOR DETAIL ======== -->

<A NAME="constructor_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TD COLSPAN=1><FONT SIZE="+2">
<B>Constructor Detail</B></FONT></TD>
</TR>
</TABLE>

<A NAME="RCDoubleMatrix2D(double[][])"><!-- --></A><H3>
RCDoubleMatrix2D</H3>
<PRE>
public <B>RCDoubleMatrix2D</B>(double[][]&nbsp;values)</PRE>
<DL>
<DD>Constructs a matrix with a copy of the given values.
 <tt>values</tt> is required to have the form <tt>values[row][column]</tt>
 and have exactly the same number of columns in every row.
 <p>
 The values are copied. So subsequent changes in <tt>values</tt> are not reflected in the matrix, and vice-versa.
<P>
<DT><B>Parameters:</B><DD><CODE>values</CODE> - The values to be filled into the new matrix.
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/IllegalArgumentException.html" title="class or interface in java.lang">IllegalArgumentException</A></CODE> - if <tt>for any 1 &lt;= row &lt; values.length: values[row].length != values[row-1].length</tt>.</DL>
<HR>

<A NAME="RCDoubleMatrix2D(int, int)"><!-- --></A><H3>
RCDoubleMatrix2D</H3>
<PRE>
public <B>RCDoubleMatrix2D</B>(int&nbsp;rows,
                        int&nbsp;columns)</PRE>
<DL>
<DD>Constructs a matrix with a given number of rows and columns.
 All entries are initially <tt>0</tt>.
<P>
<DT><B>Parameters:</B><DD><CODE>rows</CODE> - the number of rows the matrix shall have.<DD><CODE>columns</CODE> - the number of columns the matrix shall have.
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/IllegalArgumentException.html" title="class or interface in java.lang">IllegalArgumentException</A></CODE> - if <tt>rows<0 || columns<0 || (double)columns*rows > Integer.MAX_VALUE</tt>.</DL>

<!-- ============ METHOD DETAIL ========== -->

<A NAME="method_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TD COLSPAN=1><FONT SIZE="+2">
<B>Method Detail</B></FONT></TD>
</TR>
</TABLE>

<A NAME="assign(double)"><!-- --></A><H3>
assign</H3>
<PRE>
public <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A> <B>assign</B>(double&nbsp;value)</PRE>
<DL>
<DD>Sets all cells to the state specified by <tt>value</tt>.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#assign(double)">assign</A></CODE> in class <CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>value</CODE> - the value to be filled into the cells.
<DT><B>Returns:</B><DD><tt>this</tt> (for convenience only).</DL>
</DD>
</DL>
<HR>

<A NAME="assign(cern.colt.function.DoubleFunction)"><!-- --></A><H3>
assign</H3>
<PRE>
public <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A> <B>assign</B>(<A HREF="../../../../cern/colt/function/DoubleFunction.html" title="interface in cern.colt.function">DoubleFunction</A>&nbsp;function)</PRE>
<DL>
<DD><B>Description copied from class: <CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></B></DD>
<DD>Assigns the result of a function to each cell; <tt>x[row,col] = function(x[row,col])</tt>.
<p>
<b>Example:</b>
<pre>
matrix = 2 x 2 matrix 
0.5 1.5      
2.5 3.5

// change each cell to its sine
matrix.assign(cern.jet.math.Functions.sin);
-->
2 x 2 matrix
0.479426  0.997495 
0.598472 -0.350783
</pre>
For further examples, see the <a href="../../../../cern/colt/matrix/package-summary.html#FunctionObjects">package doc</a>.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#assign(cern.colt.function.DoubleFunction)">assign</A></CODE> in class <CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>function</CODE> - a function object taking as argument the current cell's value.
<DT><B>Returns:</B><DD><tt>this</tt> (for convenience only).<DT><B>See Also:</B><DD><A HREF="../../../../cern/jet/math/Functions.html" title="class in cern.jet.math"><CODE>Functions</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="assign(cern.colt.matrix.DoubleMatrix2D)"><!-- --></A><H3>
assign</H3>
<PRE>
public <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A> <B>assign</B>(<A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A>&nbsp;source)</PRE>
<DL>
<DD>Replaces all cell values of the receiver with the values of another matrix.
 Both matrices must have the same number of rows and columns.
 If both matrices share the same cells (as is the case if they are views derived from the same matrix) and intersect in an ambiguous way, then replaces <i>as if</i> using an intermediate auxiliary deep copy of <tt>other</tt>.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#assign(cern.colt.matrix.DoubleMatrix2D)">assign</A></CODE> in class <CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>source</CODE> - the source matrix to copy from (may be identical to the receiver).
<DT><B>Returns:</B><DD><tt>this</tt> (for convenience only).
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/IllegalArgumentException.html" title="class or interface in java.lang">IllegalArgumentException</A></CODE> - if <tt>columns() != source.columns() || rows() != source.rows()</tt></DL>
</DD>
</DL>
<HR>

<A NAME="assign(cern.colt.matrix.DoubleMatrix2D, cern.colt.function.DoubleDoubleFunction)"><!-- --></A><H3>
assign</H3>
<PRE>
public <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A> <B>assign</B>(<A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A>&nbsp;y,
                             <A HREF="../../../../cern/colt/function/DoubleDoubleFunction.html" title="interface in cern.colt.function">DoubleDoubleFunction</A>&nbsp;function)</PRE>
<DL>
<DD><B>Description copied from class: <CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></B></DD>
<DD>Assigns the result of a function to each cell; <tt>x[row,col] = function(x[row,col],y[row,col])</tt>.
<p>
<b>Example:</b>
<pre>
// assign x[row,col] = x[row,col]<sup>y[row,col]</sup>
m1 = 2 x 2 matrix 
0 1 
2 3

m2 = 2 x 2 matrix 
0 2 
4 6

m1.assign(m2, cern.jet.math.Functions.pow);
-->
m1 == 2 x 2 matrix
 1   1 
16 729
</pre>
For further examples, see the <a href="../../../../cern/colt/matrix/package-summary.html#FunctionObjects">package doc</a>.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#assign(cern.colt.matrix.DoubleMatrix2D, cern.colt.function.DoubleDoubleFunction)">assign</A></CODE> in class <CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>y</CODE> - the secondary matrix to operate on.<DD><CODE>function</CODE> - a function object taking as first argument the current cell's value of <tt>this</tt>,
and as second argument the current cell's value of <tt>y</tt>,
<DT><B>Returns:</B><DD><tt>this</tt> (for convenience only).<DT><B>See Also:</B><DD><A HREF="../../../../cern/jet/math/Functions.html" title="class in cern.jet.math"><CODE>Functions</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="forEachNonZero(cern.colt.function.IntIntDoubleFunction)"><!-- --></A><H3>
forEachNonZero</H3>
<PRE>
public <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A> <B>forEachNonZero</B>(<A HREF="../../../../cern/colt/function/IntIntDoubleFunction.html" title="interface in cern.colt.function">IntIntDoubleFunction</A>&nbsp;function)</PRE>
<DL>
<DD><B>Description copied from class: <CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></B></DD>
<DD>Assigns the result of a function to each <i>non-zero</i> cell; <tt>x[row,col] = function(x[row,col])</tt>.
 Use this method for fast special-purpose iteration.
 If you want to modify another matrix instead of <tt>this</tt> (i.e. work in read-only mode), simply return the input value unchanged.

 Parameters to function are as follows: <tt>first==row</tt>, <tt>second==column</tt>, <tt>third==nonZeroValue</tt>.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#forEachNonZero(cern.colt.function.IntIntDoubleFunction)">forEachNonZero</A></CODE> in class <CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>function</CODE> - a function object taking as argument the current non-zero cell's row, column and value.
<DT><B>Returns:</B><DD><tt>this</tt> (for convenience only).</DL>
</DD>
</DL>
<HR>

<A NAME="getQuick(int, int)"><!-- --></A><H3>
getQuick</H3>
<PRE>
public double <B>getQuick</B>(int&nbsp;row,
                       int&nbsp;column)</PRE>
<DL>
<DD>Returns the matrix cell value at coordinate <tt>[row,column]</tt>.

 <p>Provided with invalid parameters this method may return invalid objects without throwing any exception.
 <b>You should only use this method when you are absolutely sure that the coordinate is within bounds.</b>
 Precondition (unchecked): <tt>0 &lt;= column &lt; columns() && 0 &lt;= row &lt; rows()</tt>.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>row</CODE> - the index of the row-coordinate.<DD><CODE>column</CODE> - the index of the column-coordinate.
<DT><B>Returns:</B><DD>the value at the specified coordinate.</DL>
</DD>
</DL>
<HR>

<A NAME="like(int, int)"><!-- --></A><H3>
like</H3>
<PRE>
public <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A> <B>like</B>(int&nbsp;rows,
                           int&nbsp;columns)</PRE>
<DL>
<DD>Construct and returns a new empty matrix <i>of the same dynamic type</i> as the receiver, having the specified number of rows and columns.
 For example, if the receiver is an instance of type <tt>DenseDoubleMatrix2D</tt> the new matrix must also be of type <tt>DenseDoubleMatrix2D</tt>,
 if the receiver is an instance of type <tt>SparseDoubleMatrix2D</tt> the new matrix must also be of type <tt>SparseDoubleMatrix2D</tt>, etc.
 In general, the new matrix should have internal parametrization as similar as possible.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>rows</CODE> - the number of rows the matrix shall have.<DD><CODE>columns</CODE> - the number of columns the matrix shall have.
<DT><B>Returns:</B><DD>a new empty matrix of the same dynamic type.</DL>
</DD>
</DL>
<HR>

<A NAME="like1D(int)"><!-- --></A><H3>
like1D</H3>
<PRE>
public <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html" title="class in cern.colt.matrix">DoubleMatrix1D</A> <B>like1D</B>(int&nbsp;size)</PRE>
<DL>
<DD>Construct and returns a new 1-d matrix <i>of the corresponding dynamic type</i>, entirelly independent of the receiver.
 For example, if the receiver is an instance of type <tt>DenseDoubleMatrix2D</tt> the new matrix must be of type <tt>DenseDoubleMatrix1D</tt>,
 if the receiver is an instance of type <tt>SparseDoubleMatrix2D</tt> the new matrix must be of type <tt>SparseDoubleMatrix1D</tt>, etc.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>size</CODE> - the number of cells the matrix shall have.
<DT><B>Returns:</B><DD>a new matrix of the corresponding dynamic type.</DL>
</DD>
</DL>
<HR>

<A NAME="setQuick(int, int, double)"><!-- --></A><H3>
setQuick</H3>
<PRE>
public void <B>setQuick</B>(int&nbsp;row,
                     int&nbsp;column,
                     double&nbsp;value)</PRE>
<DL>
<DD>Sets the matrix cell at coordinate <tt>[row,column]</tt> to the specified value.

 <p>Provided with invalid parameters this method may access illegal indexes without throwing any exception.
 <b>You should only use this method when you are absolutely sure that the coordinate is within bounds.</b>
 Precondition (unchecked): <tt>0 &lt;= column &lt; columns() && 0 &lt;= row &lt; rows()</tt>.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>row</CODE> - the index of the row-coordinate.<DD><CODE>column</CODE> - the index of the column-coordinate.<DD><CODE>value</CODE> - the value to be filled into the specified cell.</DL>
</DD>
</DL>
<HR>

<A NAME="trimToSize()"><!-- --></A><H3>
trimToSize</H3>
<PRE>
public void <B>trimToSize</B>()</PRE>
<DL>
<DD><B>Description copied from class: <CODE><A HREF="../../../../cern/colt/matrix/impl/AbstractMatrix.html" title="class in cern.colt.matrix.impl">AbstractMatrix</A></CODE></B></DD>
<DD>Releases any superfluous internal memory. An application can use this operation to minimize the 
 storage of the receiver.
 <p>
 This default implementation does nothing. Override this method if necessary.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../cern/colt/matrix/impl/AbstractMatrix.html#trimToSize()">trimToSize</A></CODE> in class <CODE><A HREF="../../../../cern/colt/matrix/impl/AbstractMatrix.html" title="class in cern.colt.matrix.impl">AbstractMatrix</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="zMult(cern.colt.matrix.DoubleMatrix1D, cern.colt.matrix.DoubleMatrix1D, double, double, boolean)"><!-- --></A><H3>
zMult</H3>
<PRE>
public <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html" title="class in cern.colt.matrix">DoubleMatrix1D</A> <B>zMult</B>(<A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html" title="class in cern.colt.matrix">DoubleMatrix1D</A>&nbsp;y,
                            <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html" title="class in cern.colt.matrix">DoubleMatrix1D</A>&nbsp;z,
                            double&nbsp;alpha,
                            double&nbsp;beta,
                            boolean&nbsp;transposeA)</PRE>
<DL>
<DD><B>Description copied from class: <CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></B></DD>
<DD>Linear algebraic matrix-vector multiplication; <tt>z = alpha * A * y + beta*z</tt>.
 <tt>z[i] = alpha*Sum(A[i,j] * y[j]) + beta*z[i], i=0..A.rows()-1, j=0..y.size()-1</tt>.
 Where <tt>A == this</tt>.
 <br>
 Note: Matrix shape conformance is checked <i>after</i> potential transpositions.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#zMult(cern.colt.matrix.DoubleMatrix1D, cern.colt.matrix.DoubleMatrix1D, double, double, boolean)">zMult</A></CODE> in class <CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>y</CODE> - the source vector.<DD><CODE>z</CODE> - the vector where results are to be stored. Set this parameter to <tt>null</tt> to indicate that a new result vector shall be constructed.
<DT><B>Returns:</B><DD>z (for convenience only).</DL>
</DD>
</DL>
<HR>

<A NAME="zMult(cern.colt.matrix.DoubleMatrix2D, cern.colt.matrix.DoubleMatrix2D, double, double, boolean, boolean)"><!-- --></A><H3>
zMult</H3>
<PRE>
public <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A> <B>zMult</B>(<A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A>&nbsp;B,
                            <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A>&nbsp;C,
                            double&nbsp;alpha,
                            double&nbsp;beta,
                            boolean&nbsp;transposeA,
                            boolean&nbsp;transposeB)</PRE>
<DL>
<DD><B>Description copied from class: <CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></B></DD>
<DD>Linear algebraic matrix-matrix multiplication; <tt>C = alpha * A x B + beta*C</tt>.
 <tt>C[i,j] = alpha*Sum(A[i,k] * B[k,j]) + beta*C[i,j], k=0..n-1</tt>.
 <br>
 Matrix shapes: <tt>A(m x n), B(n x p), C(m x p)</tt>.
 <br>
 Note: Matrix shape conformance is checked <i>after</i> potential transpositions.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#zMult(cern.colt.matrix.DoubleMatrix2D, cern.colt.matrix.DoubleMatrix2D, double, double, boolean, boolean)">zMult</A></CODE> in class <CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>B</CODE> - the second source matrix.<DD><CODE>C</CODE> - the matrix where results are to be stored. Set this parameter to <tt>null</tt> to indicate that a new result matrix shall be constructed.
<DT><B>Returns:</B><DD>C (for convenience only).</DL>
</DD>
</DL>
<HR>

<A NAME="viewColumn(int)"><!-- --></A><H3>
viewColumn</H3>
<PRE>
public <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html" title="class in cern.colt.matrix">DoubleMatrix1D</A> <B>viewColumn</B>(int&nbsp;column)</PRE>
<DL>
<DD>Constructs and returns a new <i>slice view</i> representing the rows of the given column.
The returned view is backed by this matrix, so changes in the returned view are reflected in this matrix, and vice-versa.
To obtain a slice view on subranges, construct a sub-ranging view (<tt>viewPart(...)</tt>), then apply this method to the sub-range view.
<p> 
<b>Example:</b> 
<table border="0">
  <tr nowrap> 
        <td valign="top">2 x 3 matrix: <br>
          1, 2, 3<br>
          4, 5, 6 </td>
        <td>viewColumn(0) ==></td>
        <td valign="top">Matrix1D of size 2:<br>
          1, 4</td>
   </tr>
</table>
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#viewColumn(int)">viewColumn</A></CODE> in class <CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>column</CODE> - the column to fix.
<DT><B>Returns:</B><DD>a new slice view.
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/IndexOutOfBoundsException.html" title="class or interface in java.lang">IndexOutOfBoundsException</A></CODE> - if <tt>column < 0 || column >= columns()</tt>.<DT><B>See Also:</B><DD><CODE>WrapperDoubleMatrix2D.viewRow(int)</CODE></DL>
</DD>
</DL>
<HR>

<A NAME="viewColumnFlip()"><!-- --></A><H3>
viewColumnFlip</H3>
<PRE>
public <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A> <B>viewColumnFlip</B>()</PRE>
<DL>
<DD>Constructs and returns a new <i>flip view</i> along the column axis.
What used to be column <tt>0</tt> is now column <tt>columns()-1</tt>, ..., what used to be column <tt>columns()-1</tt> is now column <tt>0</tt>.
The returned view is backed by this matrix, so changes in the returned view are reflected in this matrix, and vice-versa.
<p> 
<b>Example:</b> 
<table border="0">
  <tr nowrap> 
        <td valign="top">2 x 3 matrix: <br>
          1, 2, 3<br>
          4, 5, 6 </td>
        <td>columnFlip ==></td>
        <td valign="top">2 x 3 matrix:<br>
          3, 2, 1 <br>
          6, 5, 4</td>
        <td>columnFlip ==></td>
        <td valign="top">2 x 3 matrix: <br>
          1, 2, 3<br>
          4, 5, 6 </td>
  </tr>
</table>
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#viewColumnFlip()">viewColumnFlip</A></CODE> in class <CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>a new flip view.<DT><B>See Also:</B><DD><CODE>WrapperDoubleMatrix2D.viewRowFlip()</CODE></DL>
</DD>
</DL>
<HR>

<A NAME="viewDice()"><!-- --></A><H3>
viewDice</H3>
<PRE>
public <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A> <B>viewDice</B>()</PRE>
<DL>
<DD>Constructs and returns a new <i>dice (transposition) view</i>; Swaps axes; example: 3 x 4 matrix --> 4 x 3 matrix.
The view has both dimensions exchanged; what used to be columns become rows, what used to be rows become columns.
In other words: <tt>view.get(row,column)==this.get(column,row)</tt>.
This is a zero-copy transposition, taking O(1), i.e. constant time.
The returned view is backed by this matrix, so changes in the returned view are reflected in this matrix, and vice-versa. 
Use idioms like <tt>result = viewDice(A).copy()</tt> to generate an independent transposed matrix.
<p> 
<b>Example:</b> 
<table border="0">
  <tr nowrap> 
        <td valign="top">2 x 3 matrix: <br>
          1, 2, 3<br>
          4, 5, 6 </td>
        <td>transpose ==></td>
        <td valign="top">3 x 2 matrix:<br>
          1, 4 <br>
          2, 5 <br>
          3, 6</td>
        <td>transpose ==></td>
        <td valign="top">2 x 3 matrix: <br>
          1, 2, 3<br>
          4, 5, 6 </td>
  </tr>
</table>
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#viewDice()">viewDice</A></CODE> in class <CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>a new dice view.</DL>
</DD>
</DL>
<HR>

<A NAME="viewPart(int, int, int, int)"><!-- --></A><H3>
viewPart</H3>
<PRE>
public <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A> <B>viewPart</B>(int&nbsp;row,
                               int&nbsp;column,
                               int&nbsp;height,
                               int&nbsp;width)</PRE>
<DL>
<DD>Constructs and returns a new <i>sub-range view</i> that is a <tt>height x width</tt> sub matrix starting at <tt>[row,column]</tt>.

Operations on the returned view can only be applied to the restricted range.
Any attempt to access coordinates not contained in the view will throw an <tt>IndexOutOfBoundsException</tt>.
<p>
<b>Note that the view is really just a range restriction:</b> 
The returned matrix is backed by this matrix, so changes in the returned matrix are reflected in this matrix, and vice-versa. 
<p>
The view contains the cells from <tt>[row,column]</tt> to <tt>[row+height-1,column+width-1]</tt>, all inclusive.
and has <tt>view.rows() == height; view.columns() == width;</tt>.
A view's legal coordinates are again zero based, as usual.
In other words, legal coordinates of the view range from <tt>[0,0]</tt> to <tt>[view.rows()-1==height-1,view.columns()-1==width-1]</tt>.
As usual, any attempt to access a cell at a coordinate <tt>column&lt;0 || column&gt;=view.columns() || row&lt;0 || row&gt;=view.rows()</tt> will throw an <tt>IndexOutOfBoundsException</tt>.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#viewPart(int, int, int, int)">viewPart</A></CODE> in class <CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>row</CODE> - The index of the row-coordinate.<DD><CODE>column</CODE> - The index of the column-coordinate.<DD><CODE>height</CODE> - The height of the box.<DD><CODE>width</CODE> - The width of the box.
<DT><B>Returns:</B><DD>the new view.
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/IndexOutOfBoundsException.html" title="class or interface in java.lang">IndexOutOfBoundsException</A></CODE> - if <tt>column<0 || width<0 || column+width>columns() || row<0 || height<0 || row+height>rows()</tt></DL>
</DD>
</DL>
<HR>

<A NAME="viewRow(int)"><!-- --></A><H3>
viewRow</H3>
<PRE>
public <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html" title="class in cern.colt.matrix">DoubleMatrix1D</A> <B>viewRow</B>(int&nbsp;row)</PRE>
<DL>
<DD>Constructs and returns a new <i>slice view</i> representing the columns of the given row.
The returned view is backed by this matrix, so changes in the returned view are reflected in this matrix, and vice-versa.
To obtain a slice view on subranges, construct a sub-ranging view (<tt>viewPart(...)</tt>), then apply this method to the sub-range view.
<p> 
<b>Example:</b> 
<table border="0">
  <tr nowrap> 
        <td valign="top">2 x 3 matrix: <br>
          1, 2, 3<br>
          4, 5, 6 </td>
        <td>viewRow(0) ==></td>
        <td valign="top">Matrix1D of size 3:<br>
          1, 2, 3</td>
   </tr>
</table>
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#viewRow(int)">viewRow</A></CODE> in class <CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>row</CODE> - the row to fix.
<DT><B>Returns:</B><DD>a new slice view.
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/IndexOutOfBoundsException.html" title="class or interface in java.lang">IndexOutOfBoundsException</A></CODE> - if <tt>row < 0 || row >= rows()</tt>.<DT><B>See Also:</B><DD><CODE>WrapperDoubleMatrix2D.viewColumn(int)</CODE></DL>
</DD>
</DL>
<HR>

<A NAME="viewRowFlip()"><!-- --></A><H3>
viewRowFlip</H3>
<PRE>
public <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A> <B>viewRowFlip</B>()</PRE>
<DL>
<DD>Constructs and returns a new <i>flip view</i> along the row axis.
What used to be row <tt>0</tt> is now row <tt>rows()-1</tt>, ..., what used to be row <tt>rows()-1</tt> is now row <tt>0</tt>.
The returned view is backed by this matrix, so changes in the returned view are reflected in this matrix, and vice-versa.
<p> 
<b>Example:</b> 
<table border="0">
  <tr nowrap> 
        <td valign="top">2 x 3 matrix: <br>
          1, 2, 3<br>
          4, 5, 6 </td>
        <td>rowFlip ==></td>
        <td valign="top">2 x 3 matrix:<br>
          4, 5, 6 <br>
          1, 2, 3</td>
        <td>rowFlip ==></td>
        <td valign="top">2 x 3 matrix: <br>
          1, 2, 3<br>
          4, 5, 6 </td>
  </tr>
</table>
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#viewRowFlip()">viewRowFlip</A></CODE> in class <CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>a new flip view.<DT><B>See Also:</B><DD><CODE>WrapperDoubleMatrix2D.viewColumnFlip()</CODE></DL>
</DD>
</DL>
<HR>

<A NAME="viewSelection(int[], int[])"><!-- --></A><H3>
viewSelection</H3>
<PRE>
public <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A> <B>viewSelection</B>(int[]&nbsp;rowIndexes,
                                    int[]&nbsp;columnIndexes)</PRE>
<DL>
<DD>Constructs and returns a new <i>selection view</i> that is a matrix holding the indicated cells.
There holds <tt>view.rows() == rowIndexes.length, view.columns() == columnIndexes.length</tt> and <tt>view.get(i,j) == this.get(rowIndexes[i],columnIndexes[j])</tt>.
Indexes can occur multiple times and can be in arbitrary order.
<p>
<b>Example:</b>
<pre>
this = 2 x 3 matrix:
1, 2, 3
4, 5, 6
rowIndexes     = (0,1)
columnIndexes  = (1,0,1,0)
-->
view = 2 x 4 matrix:
2, 1, 2, 1
5, 4, 5, 4
</pre>
Note that modifying the index arguments after this call has returned has no effect on the view.
The returned view is backed by this matrix, so changes in the returned view are reflected in this matrix, and vice-versa. 
<p>
To indicate "all" rows or "all columns", simply set the respective parameter
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#viewSelection(int[], int[])">viewSelection</A></CODE> in class <CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>rowIndexes</CODE> - The rows of the cells that shall be visible in the new view. To indicate that <i>all</i> rows shall be visible, simply set this parameter to <tt>null</tt>.<DD><CODE>columnIndexes</CODE> - The columns of the cells that shall be visible in the new view. To indicate that <i>all</i> columns shall be visible, simply set this parameter to <tt>null</tt>.
<DT><B>Returns:</B><DD>the new view.
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/IndexOutOfBoundsException.html" title="class or interface in java.lang">IndexOutOfBoundsException</A></CODE> - if <tt>!(0 <= rowIndexes[i] < rows())</tt> for any <tt>i=0..rowIndexes.length()-1</tt>.
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/IndexOutOfBoundsException.html" title="class or interface in java.lang">IndexOutOfBoundsException</A></CODE> - if <tt>!(0 <= columnIndexes[i] < columns())</tt> for any <tt>i=0..columnIndexes.length()-1</tt>.</DL>
</DD>
</DL>
<HR>

<A NAME="viewStrides(int, int)"><!-- --></A><H3>
viewStrides</H3>
<PRE>
public <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A> <B>viewStrides</B>(int&nbsp;_rowStride,
                                  int&nbsp;_columnStride)</PRE>
<DL>
<DD>Constructs and returns a new <i>stride view</i> which is a sub matrix consisting of every i-th cell.
More specifically, the view has <tt>this.rows()/rowStride</tt> rows and <tt>this.columns()/columnStride</tt> columns holding cells <tt>this.get(i*rowStride,j*columnStride)</tt> for all <tt>i = 0..rows()/rowStride - 1, j = 0..columns()/columnStride - 1</tt>.
The returned view is backed by this matrix, so changes in the returned view are reflected in this matrix, and vice-versa.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html#viewStrides(int, int)">viewStrides</A></CODE> in class <CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>_rowStride</CODE> - the row step factor.<DD><CODE>_columnStride</CODE> - the column step factor.
<DT><B>Returns:</B><DD>a new view.
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/IndexOutOfBoundsException.html" title="class or interface in java.lang">IndexOutOfBoundsException</A></CODE> - if <tt>rowStride<=0 || columnStride<=0</tt>.</DL>
</DD>
</DL>
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