MATLAB: How to create a standalon exe of mfile including mexfunction

matlab coderMATLAB Compilermexfunctionstandlone

I created a mfile, including the matlab function and the mexfunction by c++. How do I create a standalon exe of this mfile? The mfile can execute in the Matlab envirement. But I try to create a standlon exe of the mfile and executing without the Matlab envirement.

Best Answer

Since you would like to compile a MEX-function, which needs MATLAB runtime libraries to be executed, the right choice would be for you to pick the MATLAB Compiler product to produce an executable from your MATLAB-file. Note, however, that the MATLAB Compiler Runtime (MCR) needs to be installed on all target machines to be able to run the executable.

If you would like a truly standalone executable, you will need to use MATLAB Coder, which has a stricter set of rules for the MATLAB language subset that you can generate C/C++ code from. However, you cannot generate code from MEX-files, so you might instead want to get rid of the MEX-wrapper and directly call the C code from your MATLAB code using coder.ceval so that the corresponding calls into the C code are directly inlined into the generated code.

Related Solutions

MATLAB: Is it possible to call an external MEX file from a stand-alone application without including the MEX file during the compilation in MATLAB 7.6 (R2008a)

When a program that depends on MEX file is compiled as a stand-alone, an AUTH file is generated for the MEX file. If the user does not include the MEX file during compilation, this AUTH file will not be generated.

Thus, even if the stand-alone application can locate the MEX file at runtime, it does not have the appropriate AUTH file to execute it. So it is not possible to call an external MEX function from a compiled stand-alone application.

MATLAB: How to Loop in mexfunction

You have a fundamental misunderstanding of how the C language works with pass-by-value scalar arguments. In this code:

    void arrayMultiplier( double *vec, double *arr, int n, int temp ,double *z){  /* (1) */
        temp = temp + 1;  /* (2) */
        :
    void mexFunction( int nlhs, mxArray *plhs[],
                      int nrhs, const mxArray *prhs[]) {
        int tempr;
        tempr = mxGetScalar(prhs[3]);  /* (3) */
        arrayMultiplier(vec,arr,nr,tempr,outMatrix);  /* (4) */

You pass in numb from MATLAB. In (3) above you get a copy of numb and place it in the tempr variable. From that point on you are working with the copy, not the original. So there is no way to alter the original numb by modifying tempr. Additionally, in (4) you pass tempr by value to the arrayMultiplier function. That means in (1) the temp variable is a copy of the tempr variable. You are not working with tempr directly anymore. So in (2) when you add 1 to temp, you are adding 1 to the copy and this has no effect on the original tempr variable.

There are ways to alter the MATLAB numb variable inplace in a mex routine using data pointers, but this violates the const attribute of prhs[ ] and is not advised because it can have nasty side effects.

You also asked about how to multiply matrices in mex functions without using loops. The short answer is to simply call the same BLAS library function that MATLAB uses in the background for matrix multiplies, which is dgemm for full double precision variables. You can see the interface here:

https://www.netlib.org/blas/

Some instructions for doing this in MATLAB can be found here:

https://www.mathworks.com/help/matlab/matlab_external/calling-lapack-and-blas-functions-from-mex-files.html?searchHighlight=BLAS&s_tid=srchtitle

Best Answer

Related Solutions

MATLAB: Is it possible to call an external MEX file from a stand-alone application without including the MEX file during the compilation in MATLAB 7.6 (R2008a)

MATLAB: How to Loop in mexfunction

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