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.
© 1996–2018 John W. Eaton
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https://octave.org/doc/interpreter/Using-Sparse-Matrices-in-Oct_002dFiles.html