(octave.info)Mex-Files

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A.2 Mex-Files
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Octave includes an interface to allow legacy mex-files to be compiled
and used with Octave.  This interface can also be used to share compiled
code between Octave and MATLAB users.  However, as mex-files expose
MATLAB’s internal API, and the internal structure of Octave is
different, a mex-file can never have the same performance in Octave as
the equivalent oct-file.  In particular, to support the manner in which
variables are passed to mex functions there are a significant number of
additional copies of memory blocks when invoking or returning from a
mex-file function.  For this reason, it is recommended that any new code
be written with the oct-file interface previously discussed.

Getting Started with Mex-Files

Working with Matrices and Arrays in Mex-Files

Character Strings in Mex-Files

Cell Arrays with Mex-Files

Structures with Mex-Files

Sparse Matrices with Mex-Files

Calling Other Functions in Mex-Files