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Next: <a href="Sparse-Matrices-Initializing-Elements.html#Sparse-Matrices-Initializing-Elements" accesskey="n" rel="next">Sparse Matrices Initializing Elements</a>, Previous: <a href="Sparse-Matrices-Allocation.html#Sparse-Matrices-Allocation" accesskey="p" rel="previous">Sparse Matrices Allocation</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="Accessing-Matrix-Elements"></a>
<h3 class="section">41.3 Accessing Matrix Elements</h3>
<a name="index-sparse-matrices_002c-accessing-elements"></a>

<dl>
<dt><a name="index-gsl_005fspmatrix_005fget"></a>Function: <em>double</em> <strong>gsl_spmatrix_get</strong> <em>(const gsl_spmatrix * <var>m</var>, const size_t <var>i</var>, const size_t <var>j</var>)</em></dt>
<dd><p>This function returns element (<var>i</var>,<var>j</var>) of the matrix <var>m</var>.
The matrix may be in triplet or compressed format.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005fspmatrix_005fset"></a>Function: <em>int</em> <strong>gsl_spmatrix_set</strong> <em>(gsl_spmatrix * <var>m</var>, const size_t <var>i</var>, const size_t <var>j</var>, const double <var>x</var>)</em></dt>
<dd><p>This function sets element (<var>i</var>,<var>j</var>) of the matrix <var>m</var> to
the value <var>x</var>. The matrix must be in triplet representation.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005fspmatrix_005fptr"></a>Function: <em>double *</em> <strong>gsl_spmatrix_ptr</strong> <em>(gsl_spmatrix * <var>m</var>, const size_t <var>i</var>, const size_t <var>j</var>)</em></dt>
<dd><p>This function returns a pointer to the (<var>i</var>,<var>j</var>) element of the matrix <var>m</var>.
If the (<var>i</var>,<var>j</var>) element is not explicitly stored in the matrix,
a null pointer is returned.
</p></dd></dl>




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