MATLAB: How to delete variables in the MAT-file without loading them into MATLAB 7.2 (R2006a)

deletematmatfileMATLAB

I would like to delete variables in a MAT-file without loading them into MATLAB first.

For example, I have a file called myFile.mat which contains many variables resulting in a large MAT-file which is slow to load. I don't need all of the variables in the file.

Best Answer

MATLAB itself does not offer any functionality for deleting a particular variable from a MAT file.

However the MAT FILE API provides the matDeleteVariable function which allows you to delete a variable from a MAT file by its name. You can create a small MEX function in order to call matDeleteVariable. An example is attached.

Related Solutions

MATLAB: Guidance in writing mexFunction for convert.c

Try putting this at the top of the file and then mex it:

// One input argument: The Filename
int main(int argc, char **argv);
#include "mex.h"
void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
    int argc = 2;
    char *argv[2];
    if( nrhs == 1 && mxIsChar(prhs[0]) ) {
        argv[1] = mxArrayToString(prhs[0]);
        main(argc,argv);
        mxFree(argv[1]);
    } else {
        mexErrMsgTxt("Expected one input, the filename");
    }
}

MATLAB: C-Mex Error: expected “…” or “,”

mxArray*plhs[] needs a comma after it

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Related Solutions

MATLAB: Guidance in writing mexFunction for convert.c

MATLAB: C-Mex Error: expected “…” or “,”

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