64bit Linux opening .mat file in C: library not linking

Hello,

I am trying to open a .mat file in C, but I am having lots of trouble. The code I am running is simple for now:

---------------------------------------------

#include <stdio.h>
#include <stdlib.h>

#include "mat.h"

int main(int argc, char **argv)
{

    MATFile *spikemat;
    const char* name = NULL;
    mxArray *reader;

    spikemat = matOpen("./data/dataset.mat", "r");
    if (spikemat == NULL)
    {
      printf("Error Opening File"); 
      return();
    }
    matClose(spikemat);

    return 0;
}

-------------------------------------------

However I am getting the following error when trying to compile using "gcc ptsp_detect.c -I /usr/local/MATLAB/R2010b/extern/include" (-I argument is where the header files are located):

In function `main': ptsp_detect.c:(.text+0x22): undefined reference to `matOpen' ptsp_detect.c:(.text+0x52): undefined reference to `matClose' collect2: ld returned 1 exit status

EVEN THOUGH when I look at my paths using echo $LD_LIBRARY_PATH, it spits out the "correct" entries according to [http://www.mathworks.se/help/techdoc/matlab_external/f19027.html].

/usr/local/MATLAB/R2010b/bin/glnxa64:/usr/local/MATLAB/R2010b/sys/os/glnxa64:

What else could be the problem here?

Thanks for any input. Phil

[philip tully]

Sorry forgot to add, I am using MATLAB R2010b 64bit version.

Answer 1

[Kaustubha Govind]

The shared object files to add to LD_LIBRARY_PATH are only needed at run-time (when the application attempts to load the libraries). Since you are facing an error during linking, the LD_LIBRARY_PATH setting is not relevant as yet.

You are missing some linker flags to link against the right static libraries. Perhaps the best way to compile this application would be to use the MEX command, as described in the documentation. You may use the verbose (-v) flag with the MEX command, so you can find the exact linker command that needs to be used.

[philip tully]

Beautiful, thanks Kaustubha!

[Yezheng Li]

Your documentation seems do not work!