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<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.
<div class="defun">
— Function: int <b>gsl_matrix_fwrite</b> (<var>FILE * stream, const gsl_matrix * m</var>)<var><a name="index-gsl_005fmatrix_005ffwrite-931"></a></var><br>
<blockquote><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></blockquote></div>
<div class="defun">
— Function: int <b>gsl_matrix_fread</b> (<var>FILE * stream, gsl_matrix * m</var>)<var><a name="index-gsl_005fmatrix_005ffread-932"></a></var><br>
<blockquote><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></blockquote></div>
<div class="defun">
— Function: int <b>gsl_matrix_fprintf</b> (<var>FILE * stream, const gsl_matrix * m, const char * format</var>)<var><a name="index-gsl_005fmatrix_005ffprintf-933"></a></var><br>
<blockquote><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></blockquote></div>
<div class="defun">
— Function: int <b>gsl_matrix_fscanf</b> (<var>FILE * stream, gsl_matrix * m</var>)<var><a name="index-gsl_005fmatrix_005ffscanf-934"></a></var><br>
<blockquote><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></blockquote></div>
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