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/usr/include/octave-3.8.1/octave/smx-sm-cm.h is in liboctave-dev 3.8.1-1ubuntu1.

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// DO NOT EDIT -- generated by sparse-mk-ops
#if !defined (octave_smx_sm_cm_h)
#define octave_smx_sm_cm_h 1
#include "CMatrix.h"
#include "CSparse.h"
#include "dSparse.h"
#include "Sparse-op-defs.h"
SPARSE_SMM_BIN_OP_DECLS (ComplexMatrix, SparseComplexMatrix, SparseMatrix, ComplexMatrix, OCTAVE_API)
SPARSE_SMM_CMP_OP_DECLS (SparseMatrix, ComplexMatrix, OCTAVE_API)
SPARSE_SMM_BOOL_OP_DECLS (SparseMatrix, ComplexMatrix, OCTAVE_API)
#endif