/usr/include/octave-3.8.1/octave/mx-fm-fdm.h is in liboctave-dev 3.8.1-1ubuntu1.
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 | // DO NOT EDIT -- generated by mk-ops
#if !defined (octave_mx_fm_fdm_h)
#define octave_mx_fm_fdm_h 1
#include "fMatrix.h"
#include "fDiagMatrix.h"
#include "mx-op-decl.h"
MDM_BIN_OP_DECLS (FloatMatrix, FloatMatrix, FloatDiagMatrix, OCTAVE_API)
#endif
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