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SparseDoubleMatrix1D (Colt 1.2.0 - API Specification)
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cern.colt.matrix.impl</FONT>
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Class SparseDoubleMatrix1D</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/AbstractMatrix1D.html" title="class in cern.colt.matrix.impl">cern.colt.matrix.impl.AbstractMatrix1D</A>
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by"><A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html" title="class in cern.colt.matrix">cern.colt.matrix.DoubleMatrix1D</A>
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by"><B>cern.colt.matrix.impl.SparseDoubleMatrix1D</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>
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<DL>
<DT>public class <B>SparseDoubleMatrix1D</B><DT>extends <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html" title="class in cern.colt.matrix">DoubleMatrix1D</A></DL>
<P>
Sparse hashed 1-d matrix (aka <i>vector</i>) 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>
Note that this implementation is not synchronized.
Uses a <A HREF="../../../../cern/colt/map/OpenIntDoubleHashMap.html" title="class in cern.colt.map"><CODE>OpenIntDoubleHashMap</CODE></A>, which is a compact and performant hashing technique.
<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. However, their memory is automatically reclaimed from time to time. It can also manually be reclaimed by calling <A HREF="../../../../cern/colt/matrix/impl/SparseDoubleMatrix1D.html#trimToSize()"><CODE>trimToSize()</CODE></A>.
</ul>
<p>
worst case: <tt>memory [bytes] = (1/minLoadFactor) * nonZeros * 13</tt>.
<br>best case: <tt>memory [bytes] = (1/maxLoadFactor) * nonZeros * 13</tt>.
<br>Where <tt>nonZeros = cardinality()</tt> is the number of non-zero cells.
Thus, a 1000000 matrix with minLoadFactor=0.25 and maxLoadFactor=0.5 and 1000000 non-zero cells consumes between 25 MB and 50 MB.
The same 1000000 matrix with 1000 non-zero cells consumes between 25 and 50 KB.
<p>
<b>Time complexity:</b>
<p>
This class offers <i>expected</i> time complexity <tt>O(1)</tt> (i.e. constant time) for the basic operations
<tt>get</tt>, <tt>getQuick</tt>, <tt>set</tt>, <tt>setQuick</tt> and <tt>size</tt>
assuming the hash function disperses the elements properly among the buckets.
Otherwise, pathological cases, although highly improbable, can occur, degrading performance to <tt>O(N)</tt> in the worst case.
As such this sparse class is expected to have no worse time complexity than its dense counterpart <A HREF="../../../../cern/colt/matrix/impl/DenseDoubleMatrix1D.html" title="class in cern.colt.matrix.impl"><CODE>DenseDoubleMatrix1D</CODE></A>.
However, constant factors are considerably larger.
<P>
<P>
<DL>
<DT><B>Version:</B></DT>
<DD>1.0, 09/24/99</DD>
<DT><B>See Also:</B><DD><A HREF="../../../../serialized-form.html#cern.colt.matrix.impl.SparseDoubleMatrix1D">Serialized Form</A></DL>
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<TD><CODE><B><A HREF="../../../../cern/colt/matrix/impl/SparseDoubleMatrix1D.html#SparseDoubleMatrix1D(double[])">SparseDoubleMatrix1D</A></B>(double[] values)</CODE>
<BR>
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/SparseDoubleMatrix1D.html#SparseDoubleMatrix1D(int)">SparseDoubleMatrix1D</A></B>(int size)</CODE>
<BR>
Constructs a matrix with a given number of cells.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../cern/colt/matrix/impl/SparseDoubleMatrix1D.html#SparseDoubleMatrix1D(int, int, double, double)">SparseDoubleMatrix1D</A></B>(int size,
int initialCapacity,
double minLoadFactor,
double maxLoadFactor)</CODE>
<BR>
Constructs a matrix with a given number of parameters.</TD>
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<B>Method Summary</B></FONT></TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <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/SparseDoubleMatrix1D.html#assign(double)">assign</A></B>(double value)</CODE>
<BR>
Sets all cells to the state specified by <tt>value</tt>.</TD>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../cern/colt/matrix/impl/SparseDoubleMatrix1D.html#cardinality()">cardinality</A></B>()</CODE>
<BR>
Returns the number of cells having non-zero values.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../cern/colt/matrix/impl/SparseDoubleMatrix1D.html#ensureCapacity(int)">ensureCapacity</A></B>(int minCapacity)</CODE>
<BR>
Ensures that the receiver can hold at least the specified number of non-zero cells without needing to allocate new internal memory.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> double</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../cern/colt/matrix/impl/SparseDoubleMatrix1D.html#getQuick(int)">getQuick</A></B>(int index)</CODE>
<BR>
Returns the matrix cell value at coordinate <tt>index</tt>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <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/SparseDoubleMatrix1D.html#like(int)">like</A></B>(int size)</CODE>
<BR>
Construct and returns a new empty matrix <i>of the same dynamic type</i> as the receiver, having the specified size.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <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/SparseDoubleMatrix1D.html#like2D(int, int)">like2D</A></B>(int rows,
int columns)</CODE>
<BR>
Construct and returns a new 2-d matrix <i>of the corresponding dynamic type</i>, entirelly independent of the receiver.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../cern/colt/matrix/impl/SparseDoubleMatrix1D.html#setQuick(int, double)">setQuick</A></B>(int index,
double value)</CODE>
<BR>
Sets the matrix cell at coordinate <tt>index</tt> to the specified value.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../cern/colt/matrix/impl/SparseDoubleMatrix1D.html#trimToSize()">trimToSize</A></B>()</CODE>
<BR>
Releases any superfluous memory created by explicitly putting zero values into cells formerly having non-zero values;
An application can use this operation to minimize the
storage of the receiver.</TD>
</TR>
</TABLE>
<A NAME="methods_inherited_from_class_cern.colt.matrix.DoubleMatrix1D"><!-- --></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/DoubleMatrix1D.html" title="class in cern.colt.matrix">DoubleMatrix1D</A></B></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#aggregate(cern.colt.function.DoubleDoubleFunction, cern.colt.function.DoubleFunction)">aggregate</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#aggregate(cern.colt.matrix.DoubleMatrix1D, cern.colt.function.DoubleDoubleFunction, cern.colt.function.DoubleDoubleFunction)">aggregate</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#assign(double[])">assign</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#assign(cern.colt.function.DoubleFunction)">assign</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#assign(cern.colt.matrix.DoubleMatrix1D)">assign</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#assign(cern.colt.matrix.DoubleMatrix1D, cern.colt.function.DoubleDoubleFunction)">assign</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#assign(cern.colt.matrix.DoubleMatrix1D, cern.colt.function.DoubleDoubleFunction, cern.colt.list.IntArrayList)">assign</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#copy()">copy</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#equals(double)">equals</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#equals(java.lang.Object)">equals</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#get(int)">get</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#getNonZeros(cern.colt.list.IntArrayList, cern.colt.list.DoubleArrayList)">getNonZeros</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#getNonZeros(cern.colt.list.IntArrayList, cern.colt.list.DoubleArrayList, int)">getNonZeros</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#like()">like</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#set(int, double)">set</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#swap(cern.colt.matrix.DoubleMatrix1D)">swap</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#toArray()">toArray</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#toArray(double[])">toArray</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#toString()">toString</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#viewFlip()">viewFlip</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#viewPart(int, int)">viewPart</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#viewSelection(cern.colt.function.DoubleProcedure)">viewSelection</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#viewSelection(int[])">viewSelection</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#viewSorted()">viewSorted</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#viewStrides(int)">viewStrides</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#zDotProduct(cern.colt.matrix.DoubleMatrix1D)">zDotProduct</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#zDotProduct(cern.colt.matrix.DoubleMatrix1D, int, int)">zDotProduct</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#zDotProduct(cern.colt.matrix.DoubleMatrix1D, int, int, cern.colt.list.IntArrayList)">zDotProduct</A>, <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#zSum()">zSum</A></CODE></TD>
</TR>
</TABLE>
<A NAME="methods_inherited_from_class_cern.colt.matrix.impl.AbstractMatrix1D"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<TD><B>Methods inherited from class cern.colt.matrix.impl.<A HREF="../../../../cern/colt/matrix/impl/AbstractMatrix1D.html" title="class in cern.colt.matrix.impl">AbstractMatrix1D</A></B></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../cern/colt/matrix/impl/AbstractMatrix1D.html#checkSize(cern.colt.matrix.impl.AbstractMatrix1D)">checkSize</A>, <A HREF="../../../../cern/colt/matrix/impl/AbstractMatrix1D.html#size()">size</A>, <A HREF="../../../../cern/colt/matrix/impl/AbstractMatrix1D.html#toStringShort()">toStringShort</A></CODE></TD>
</TR>
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<A NAME="SparseDoubleMatrix1D(double[])"><!-- --></A><H3>
SparseDoubleMatrix1D</H3>
<PRE>
public <B>SparseDoubleMatrix1D</B>(double[] values)</PRE>
<DL>
<DD>Constructs a matrix with a copy of the given values.
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.</DL>
<HR>
<A NAME="SparseDoubleMatrix1D(int)"><!-- --></A><H3>
SparseDoubleMatrix1D</H3>
<PRE>
public <B>SparseDoubleMatrix1D</B>(int size)</PRE>
<DL>
<DD>Constructs a matrix with a given number of cells.
All entries are initially <tt>0</tt>.
<P>
<DT><B>Parameters:</B><DD><CODE>size</CODE> - the number of cells 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>size<0</tt>.</DL>
<HR>
<A NAME="SparseDoubleMatrix1D(int, int, double, double)"><!-- --></A><H3>
SparseDoubleMatrix1D</H3>
<PRE>
public <B>SparseDoubleMatrix1D</B>(int size,
int initialCapacity,
double minLoadFactor,
double maxLoadFactor)</PRE>
<DL>
<DD>Constructs a matrix with a given number of parameters.
All entries are initially <tt>0</tt>.
For details related to memory usage see <A HREF="../../../../cern/colt/map/OpenIntDoubleHashMap.html" title="class in cern.colt.map"><CODE>OpenIntDoubleHashMap</CODE></A>.
<P>
<DT><B>Parameters:</B><DD><CODE>size</CODE> - the number of cells the matrix shall have.<DD><CODE>initialCapacity</CODE> - the initial capacity of the hash map.
If not known, set <tt>initialCapacity=0</tt> or small.<DD><CODE>minLoadFactor</CODE> - the minimum load factor of the hash map.<DD><CODE>maxLoadFactor</CODE> - the maximum load factor of the hash map.
<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>initialCapacity < 0 || (minLoadFactor < 0.0 || minLoadFactor >= 1.0) || (maxLoadFactor <= 0.0 || maxLoadFactor >= 1.0) || (minLoadFactor >= maxLoadFactor)</tt>.
<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>size<0</tt>.</DL>
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<A NAME="assign(double)"><!-- --></A><H3>
assign</H3>
<PRE>
public <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html" title="class in cern.colt.matrix">DoubleMatrix1D</A> <B>assign</B>(double 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/DoubleMatrix1D.html#assign(double)">assign</A></CODE> in class <CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html" title="class in cern.colt.matrix">DoubleMatrix1D</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="cardinality()"><!-- --></A><H3>
cardinality</H3>
<PRE>
public int <B>cardinality</B>()</PRE>
<DL>
<DD>Returns the number of cells having non-zero values.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#cardinality()">cardinality</A></CODE> in class <CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html" title="class in cern.colt.matrix">DoubleMatrix1D</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="ensureCapacity(int)"><!-- --></A><H3>
ensureCapacity</H3>
<PRE>
public void <B>ensureCapacity</B>(int minCapacity)</PRE>
<DL>
<DD>Ensures that the receiver can hold at least the specified number of non-zero cells without needing to allocate new internal memory.
If necessary, allocates new internal memory and increases the capacity of the receiver.
<p>
This method never need be called; it is for performance tuning only.
Calling this method before tt>set()</tt>ing a large number of non-zero values boosts performance,
because the receiver will grow only once instead of potentially many times and hash collisions get less probable.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../cern/colt/matrix/impl/AbstractMatrix.html#ensureCapacity(int)">ensureCapacity</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>
<DT><B>Parameters:</B><DD><CODE>minCapacity</CODE> - the desired minimum number of non-zero (non-null) cells.</DL>
</DD>
</DL>
<HR>
<A NAME="getQuick(int)"><!-- --></A><H3>
getQuick</H3>
<PRE>
public double <B>getQuick</B>(int index)</PRE>
<DL>
<DD>Returns the matrix cell value at coordinate <tt>index</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>index<0 || index>=size()</tt>.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#getQuick(int)">getQuick</A></CODE> in class <CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html" title="class in cern.colt.matrix">DoubleMatrix1D</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>index</CODE> - the index of the cell.
<DT><B>Returns:</B><DD>the value of the specified cell.</DL>
</DD>
</DL>
<HR>
<A NAME="like(int)"><!-- --></A><H3>
like</H3>
<PRE>
public <A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html" title="class in cern.colt.matrix">DoubleMatrix1D</A> <B>like</B>(int size)</PRE>
<DL>
<DD>Construct and returns a new empty matrix <i>of the same dynamic type</i> as the receiver, having the specified size.
For example, if the receiver is an instance of type <tt>DenseDoubleMatrix1D</tt> the new matrix must also be of type <tt>DenseDoubleMatrix1D</tt>,
if the receiver is an instance of type <tt>SparseDoubleMatrix1D</tt> the new matrix must also be of type <tt>SparseDoubleMatrix1D</tt>, etc.
In general, the new matrix should have internal parametrization as similar as possible.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#like(int)">like</A></CODE> in class <CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html" title="class in cern.colt.matrix">DoubleMatrix1D</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>size</CODE> - the number of cell the matrix shall have.
<DT><B>Returns:</B><DD>a new empty matrix of the same dynamic type.</DL>
</DD>
</DL>
<HR>
<A NAME="like2D(int, int)"><!-- --></A><H3>
like2D</H3>
<PRE>
public <A HREF="../../../../cern/colt/matrix/DoubleMatrix2D.html" title="class in cern.colt.matrix">DoubleMatrix2D</A> <B>like2D</B>(int rows,
int columns)</PRE>
<DL>
<DD>Construct and returns a new 2-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>DenseDoubleMatrix1D</tt> the new matrix must be of type <tt>DenseDoubleMatrix2D</tt>,
if the receiver is an instance of type <tt>SparseDoubleMatrix1D</tt> the new matrix must be of type <tt>SparseDoubleMatrix2D</tt>, etc.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#like2D(int, int)">like2D</A></CODE> in class <CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html" title="class in cern.colt.matrix">DoubleMatrix1D</A></CODE></DL>
</DD>
<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 matrix of the corresponding dynamic type.</DL>
</DD>
</DL>
<HR>
<A NAME="setQuick(int, double)"><!-- --></A><H3>
setQuick</H3>
<PRE>
public void <B>setQuick</B>(int index,
double value)</PRE>
<DL>
<DD>Sets the matrix cell at coordinate <tt>index</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>index<0 || index>=size()</tt>.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html#setQuick(int, double)">setQuick</A></CODE> in class <CODE><A HREF="../../../../cern/colt/matrix/DoubleMatrix1D.html" title="class in cern.colt.matrix">DoubleMatrix1D</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>index</CODE> - the index of the cell.<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>Releases any superfluous memory created by explicitly putting zero values into cells formerly having non-zero values;
An application can use this operation to minimize the
storage of the receiver.
<p>
<b>Background:</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. However, their memory can be reclaimed by calling <tt>trimToSize()</tt>.
</ul>
A sequence like <tt>set(i,5); set(i,0);</tt>
sets a cell to non-zero state and later back to zero state.
Such as sequence generates obsolete memory that is automatically reclaimed from time to time or can manually be reclaimed by calling <tt>trimToSize()</tt>.
Putting zeros into cells already containing zeros does not generate obsolete memory since no memory was allocated to them in the first place.
<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>
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