/usr/include/octave-4.2.2/octave/smx-sm-m.h is in liboctave-dev 4.2.2-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | // DO NOT EDIT -- generated by mk-ops.awk
#if ! defined (octave_smx_sm_m_h)
#define octave_smx_sm_m_h 1
#include "octave-config.h"
#include "dMatrix.h"
#include "dSparse.h"
#include "Sparse-op-defs.h"
SPARSE_SMM_BIN_OP_DECLS (Matrix, SparseMatrix, SparseMatrix, Matrix, OCTAVE_API)
SPARSE_SMM_CMP_OP_DECLS (SparseMatrix, Matrix, OCTAVE_API)
SPARSE_SMM_BOOL_OP_DECLS (SparseMatrix, Matrix, OCTAVE_API)
#endif
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