MATLAB: Beginner: Mex array size too large

MATLABmex large array crash crashes

Hello my friends,
i m a beginner with mex, so may be someone could help me please. i want to define a large array in my mex-code but at some point matlab crashes. Does somebody have an idea why or have a proposal for a solution? Many thanks! 🙂
Heres the code:
void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
 float  myArray[106*3*7555]; // doesnt work but works with a smaller definition

Best Answer

Your myArray is a local variable, meaning that the memory for it is obtained from the stack. The stack for your program is typically limited in size to a much smaller amount than the heap. To get your variable allocated from the heap instead of the stack you can allocate it with one of the memory allocation functions, e.g.:
void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
 float *myArray;
 myArray = mxMalloc(106*3*7555*sizeof(*myArray));
 // insert code to use myArray
 mxFree(myArray);
}
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