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<a name="Reading-and-writing-matrices"></a>
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Next: <a href="Matrix-views.html#Matrix-views" accesskey="n" rel="next">Matrix views</a>, Previous: <a href="Initializing-matrix-elements.html#Initializing-matrix-elements" accesskey="p" rel="previous">Initializing matrix elements</a>, Up: <a href="Matrices.html#Matrices" accesskey="u" rel="up">Matrices</a> &nbsp; [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="Reading-and-writing-matrices-1"></a>
<h4 class="subsection">8.4.4 Reading and writing matrices</h4>

<p>The library provides functions for reading and writing matrices to a file
as binary data or formatted text.
</p>
<dl>
<dt><a name="index-gsl_005fmatrix_005ffwrite"></a>Function: <em>int</em> <strong>gsl_matrix_fwrite</strong> <em>(FILE * <var>stream</var>, const gsl_matrix * <var>m</var>)</em></dt>
<dd><p>This function writes the elements of the matrix <var>m</var> to the stream
<var>stream</var> in binary format.  The return value is 0 for success and
<code>GSL_EFAILED</code> if there was a problem writing to the file.  Since the
data is written in the native binary format it may not be portable
between different architectures.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005fmatrix_005ffread"></a>Function: <em>int</em> <strong>gsl_matrix_fread</strong> <em>(FILE * <var>stream</var>, gsl_matrix * <var>m</var>)</em></dt>
<dd><p>This function reads into the matrix <var>m</var> from the open stream
<var>stream</var> in binary format.  The matrix <var>m</var> must be preallocated
with the correct dimensions since the function uses the size of <var>m</var> to
determine how many bytes to read.  The return value is 0 for success and
<code>GSL_EFAILED</code> if there was a problem reading from the file.  The
data is assumed to have been written in the native binary format on the
same architecture.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005fmatrix_005ffprintf"></a>Function: <em>int</em> <strong>gsl_matrix_fprintf</strong> <em>(FILE * <var>stream</var>, const gsl_matrix * <var>m</var>, const char * <var>format</var>)</em></dt>
<dd><p>This function writes the elements of the matrix <var>m</var> line-by-line to
the stream <var>stream</var> using the format specifier <var>format</var>, which
should be one of the <code>%g</code>, <code>%e</code> or <code>%f</code> formats for
floating point numbers and <code>%d</code> for integers.  The function returns
0 for success and <code>GSL_EFAILED</code> if there was a problem writing to
the file.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005fmatrix_005ffscanf"></a>Function: <em>int</em> <strong>gsl_matrix_fscanf</strong> <em>(FILE * <var>stream</var>, gsl_matrix * <var>m</var>)</em></dt>
<dd><p>This function reads formatted data from the stream <var>stream</var> into the
matrix <var>m</var>.  The matrix <var>m</var> must be preallocated with the correct
dimensions since the function uses the size of <var>m</var> to determine how many
numbers to read.  The function returns 0 for success and
<code>GSL_EFAILED</code> if there was a problem reading from the file.
</p></dd></dl>

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Next: <a href="Matrix-views.html#Matrix-views" accesskey="n" rel="next">Matrix views</a>, Previous: <a href="Initializing-matrix-elements.html#Initializing-matrix-elements" accesskey="p" rel="previous">Initializing matrix elements</a>, Up: <a href="Matrices.html#Matrices" accesskey="u" rel="up">Matrices</a> &nbsp; [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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