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Code Blocks configuration for Calling Matlab code from C/C++

Asked by Nathan on 25 Jan 2013

Hey Everybody,

I was just trying to go through a simple matlab tutorial for calling matlab code from c/c++ code and Im getting an error:

code:

    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include "engine.h"
    int main()
    {
        printf("Hello world");
        Engine *ep;
        ep = engOpen("");
        engEvalString(ep, "x=(1:1:10);");
        engEvalString(ep,"y=x.^2;");
        engEvalString(ep, "plot(x,y);");
        engClose(ep);
    return 1;
    }

Build log(Added new lines to help readability):

mingw32-gcc.exe -Wall -g -Weffc++ -std=c++0x -I"C:\Program Files\MATLAB\R2012b\extern\include" -c C:\Users\Public\Documents\C++\CToMatlab\main.c -o obj\Debug\main.o

mingw32-g++.exe -L"C:\Program Files\MATLAB\R2012b\extern\lib\win64\microsoft"

-o bin\Debug\CToMatlab.exe obj\Debug\main.o

"C:\Program Files\MATLAB\R2012b\extern\lib\win64\microsoft\libeng.lib"

"C:\Program Files\MATLAB\R2012b\extern\lib\win64\microsoft\libmat.lib"

"C:\Program Files\MATLAB\R2012b\extern\lib\win64\microsoft\libemlrt.lib"

"C:\Program Files\MATLAB\R2012b\extern\lib\win64\microsoft\libmex.lib"

"C:\Program Files\MATLAB\R2012b\extern\lib\win64\microsoft\libmwblas.lib"

"C:\Program Files\MATLAB\R2012b\extern\lib\win64\microsoft\libmwblascompat32.lib"

"C:\Program Files\MATLAB\R2012b\extern\lib\win64\microsoft\libmwlapack.lib"

"C:\Program Files\MATLAB\R2012b\extern\lib\win64\microsoft\libmwmathutil.lib"

"C:\Program Files\MATLAB\R2012b\extern\lib\win64\microsoft\libmx.lib"

"C:\Program Files\MATLAB\R2012b\extern\lib\win64\microsoft\libut.lib"

Error:

undefined reference to `engOpen' undefined reference to `engEvalString' undefined reference to engEvalString undefined reference to `engEvalString' undefined reference to `engClose'

I know that this is a linking error but not sure what I'm failing to link.

Any help would be apreciated.

0 Comments

Nathan

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3 Answers

Answer by Evgeny Pr on 25 Jan 2013
Edited by Evgeny Pr on 25 Jan 2013
Accepted answer

GCC compiler for "MATLAB Externals" is not supported on windows platform. You must use the Microsoft compiler.

...but, unfortunately in CodeBlocks IDE there is a parsing command-line for Microsoft compiler bug.

I think you should use Visual Studio Express. Everything is much easier to configure. Do not forget to specify the path to the libraries and header files to MATLAB extern:

matlabroot\extern\lib\<platform>\microsoft
matlabroot\extern\include\

0 Comments

Evgeny Pr
Answer by Nathan on 25 Jan 2013

k thanks for the help I'll probably just switch to VS now.

0 Comments

Nathan
Answer by Tonatiuh Toral on 16 Apr 2013
Edited by Tonatiuh Toral on 16 Apr 2013

Hello! I'm using Code:blocks in Ubuntu 12.10 and want to call Matlab from my C++ code. I have included the matlabroot\extern\include\ in the Search directories of my Code::blocks. I tryed with the engdemo.cpp and I'm getting the same errors.

  • undefined reference to engOpen
  • undefined reference to mxCreateDoubleMatrix
  • ...
  • ...

Can anyone help me with the proper configuration for using engine.h in Code::blocks?

Kind Regards!

1 Comment

Nathan on 16 Apr 2013

http://wiki.codeblocks.org/index.php?title=64Bit_Windows this should help with starting...... after that you still need to specify matlab files on the include and compiler settings.

Tonatiuh Toral

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