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<h5 class="subsubsection">A.1.6.3 Using Sparse Matrices in Oct-Files</h5>
<p>Most of the same operators and functions on sparse matrices that are
available from the Octave are equally available with oct-files.
The basic means of extracting a sparse matrix from an <code>octave_value</code>
and returning them as an <code>octave_value</code>, can be seen in the
following example.
<pre class="example"> octave_value_list retval;
SparseMatrix sm = args(0).sparse_matrix_value ();
SparseComplexMatrix scm =
args(1).sparse_complex_matrix_value ();
SparseBoolMatrix sbm = args(2).sparse_bool_matrix_value ();
...
retval(2) = sbm;
retval(1) = scm;
retval(0) = sm;
</pre>
<p>The conversion to an octave-value is handled by the sparse
<code>octave_value</code> constructors, and so no special care is needed.
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