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<title>GNU Scientific Library &ndash; Reference Manual: Sparse Matrices Properties</title>

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Next: <a href="Sparse-Matrices-Finding-Maximum-and-Minimum-Elements.html#Sparse-Matrices-Finding-Maximum-and-Minimum-Elements" accesskey="n" rel="next">Sparse Matrices Finding Maximum and Minimum Elements</a>, Previous: <a href="Sparse-Matrices-Operations.html#Sparse-Matrices-Operations" accesskey="p" rel="previous">Sparse Matrices Operations</a>, Up: <a href="Sparse-Matrices.html#Sparse-Matrices" accesskey="u" rel="up">Sparse Matrices</a> &nbsp; [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Matrix-Properties"></a>
<h3 class="section">41.9 Matrix Properties</h3>
<a name="index-sparse-matrices_002c-properties"></a>

<dl>
<dt><a name="index-gsl_005fspmatrix_005fnnz"></a>Function: <em>size_t</em> <strong>gsl_spmatrix_nnz</strong> <em>(const gsl_spmatrix * <var>m</var>)</em></dt>
<dd><p>This function returns the number of non-zero elements in <var>m</var>.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005fspmatrix_005fequal"></a>Function: <em>int</em> <strong>gsl_spmatrix_equal</strong> <em>(const gsl_spmatrix * <var>a</var>, const gsl_spmatrix * <var>b</var>)</em></dt>
<dd><p>This function returns 1 if the matrices <var>a</var> and <var>b</var> are equal (by comparison of
element values) and 0 otherwise. The matrices <var>a</var> and <var>b</var> must be in the same
sparse storage format for comparison.
</p></dd></dl>




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