How to call Matlab function in C++

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How to call Matlab function in C++

04 十一月 2012 by luyi0619

In order to make more people get benefits, I decide to write this tutorial in English. This tutorial displays how to call Matlab libraries in C++ in Windows platform.

Prerequisites:

1.Windows operating system, I test my code on Windows 7 Enterprise SP1 x64 and Windows 8 Pro x64.
2.Matlab, I test my code in Matlab 2010a, and newer versions are also compatible, I think.
3.Microsoft Visual Studio, I test my code on VS 2010 ultimate and VS 2012 ultimate. Express Suites maybe work well.

Step 1:

Set Path variable in Advanced system settings-> Environment Variables: C:\Program Files\MATLAB\R2010a\bin\win64 (or the path where libeng.dll is located)

Step 2:

In project properties of Visual Studio, add Additional Include directories of C++ -> General: "C:\Program Files\MATLAB\R2010a\extern\include"

Step 3:

In project properties of Visual Studio, linker->general, Additional Library Directories: "C:\Program Files\MATLAB\R2010a\extern\lib\win64\microsoft"

In project properties of Visual Studio, linker->input, Additional Dependencies: libeng.lib libmx.lib

Step 4:

Change the Active Solution Platform to x64 or x86 which depends on your Matlab runtime version.

Demo code:

The demo code will show how to create a sparse matrix, then put it into Matlab workspace.

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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
namespaceMATLAB
{
    // you can use namespace to avoid name conflicts
    #include "engine.h"
}
intmain()
{
     
    double data[4] = {5.8, 6.2, 5.9, 6.1};
    size_t    row[4] = {0, 2, 1, 3};
    size_t    col[3] = {0, 2, 4};
 
    staticMATLAB::Engine *ep = MATLAB::engOpen("\0");
    if(!ep)
    {
        fprintf(stderr,"\nCan't start MATLAB engine\n");
        return-1;
    }
 
    MATLAB::mxArray* M = MATLAB::mxCreateSparse(4, 2, 4, MATLAB::mxREAL); 
 
    double* pv = (double*)MATLAB::mxGetPr(M);
    memcpy(pv, data, 4 *sizeof(double));
 
    size_t* pi = (size_t*)MATLAB::mxGetIr(M);
    memcpy(pi, row, 4*sizeof(size_t));
 
    size_t* pj = (size_t*)MATLAB::mxGetJc(M);
    memcpy(pj, col, 3*sizeof(size_t));
     
    MATLAB::engPutVariable(ep,"M", M);
 
    MATLAB::mxDestroyArray(M);
 
    MATLAB::engEvalString(ep,"M = M'");
    MATLAB::engEvalString(ep,"M = full(M)");
 
    MATLAB::mxArray* result;
    doubleres[8];
    if((result = MATLAB::engGetVariable(ep,"M")) == NULL)
    {
          printf("Oops! You didn't create a variable X.\n\n");
    }
    memcpy((void*)res, (void*)MATLAB::mxGetPr(result),sizeof(res));
    for(inti = 0 ;i < 2 ;i ++)
    {
        for(intj = 0; j < 4; j ++)
        {
            printf("%lf ",res[j * 2 + i]);
        }
        printf("\n");
    }
    MATLAB::engClose(ep);
    return0;
}