(octave.info)Using Sparse Matrices in Oct-Files

---

Prev: Creating Sparse Matrices in Oct-Files Up: Sparse Matrices in Oct-Files

---

Enter node , (file) or (file)node

A.1.6.3 Using Sparse Matrices in Oct-Files
..........................................

Most of the same operators and functions for sparse matrices that are
available from the Octave interpreter are also available within
oct-files.  The basic means of extracting a sparse matrix from an
‘octave_value’, and returning it as an ‘octave_value’, can be seen in
the following 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;

   The conversion to an ‘octave_value’ is handled by the sparse
‘octave_value’ constructors, and so no special care is needed.