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

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.

Answer 1

[Evgeny Pr]

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\

Answer 2

[Nathan]

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

Answer 3

[Tonatiuh Toral]

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!

[Nathan]

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.

Answer 4

[Amir Sin]

Usless ans