Running compiled MATLAB from python

Question

I have some MATLAB script, for example:

function mat_foo(varargin)
    params.x = 'aaa';
    params = parse_input(params, varargin);
    disp(params.x);
end

parse_input is a function I have which convert data from varargin and override the defaults at 'params' struct.

I compiled this function and I want to call it from python, I do it the following way:

subprocess.check_call(['$/mat_foo.app/Contents/MacOS/applauncher x bbb'], shell=True)

This sets params.x to 'bbb' and works well.

My problem is that each time I want to call a compiled MATLAB it initializes the MCR and takes about 8-10 seconds. My question is if there is a way to initialize the MCR once and use it many times quickly? I use MATLAB R2013a and python 2.7.5 on OSX

I have seen compiled matlab code get called from php without 10 second waiting times at each call. So though I don't know how to achieve it, it must definitely be possible. Just to eliminate the improbable, could you test whether the problem also occurs with a trival function (that you can show here as a reproducible example). — Dennis Jaheruddin
– Dennis Jaheruddin, Commented Aug 21, 2014 at 11:44
@DennisJaheruddin: Maybe the code was generated using matlab coder, such code does not require MCR. — Daniel
– Daniel, Commented Aug 21, 2014 at 19:34
@Daniel The code was compiled by myself, so it definitely requires the MCR. I just don't know the details of how it is called but I think this can be considered proof that it can be done. — Dennis Jaheruddin
– Dennis Jaheruddin, Commented Aug 21, 2014 at 19:40

Martin Drohmann · Accepted Answer · 2015-02-16 15:58:09Z

2

It is possible to compile your code in a shared library as described here. You can load this library in python with

mymatlab = cdll.LoadLibrary("mymatlab_library.so")

and initialize and load the MCR by calling a function

mymatlab.initializeMyLibrary()

that might do nothing or only prints a text to the console with matlab's disp function.

Subsequent function calls to your library should execute immediately.

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