Is there a data size limited in the mex of cell format?

Question

wei zhang 2021-3-12

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https://ww2.mathworks.cn/matlabcentral/answers/770403-is-there-a-data-size-limited-in-the-mex-of-cell-format

关闭： wei zhang 2021-3-12

I am trying to pass some large cell arrays from mex to Matlab. I found it may stuck Matlab if the output cell array is large. Is there a limitation of cell format capacity? I know little knowledge of it. Do I use the cell format in wrong way? Any suggestion would be appreciated.

Here is an example.

In matlab

r = test1((ones(1e8,1)));% matlab crash or stuck

The cu file to build mex.

%% test1.cu
void mexFunction(int nlhs, mxArray * plhs[], int nrhs, const mxArray * prhs[])
{
    mxInitGPU();
    mxGPUArray const *a0 = mxGPUCreateFromMxArray(prhs[0]);
    double *d_a0 = (double*)mxGPUGetDataReadOnly(a0);
    int K = 1;
    prhs[0] = mxCreateCellMatrix(K,1);
    mxArray * R;
    for(int i = 0;i<K;i++)
    {
        R = mxGPUCreateMxArrayOnCPU(a0);
        mxSetCell(RESULT,i,R);
    }
    mxGPUDestroyGPUArray(a0);
    mxDestroyArray(R);
}

If I output the result without cell, like below.

r = test2((ones(1e8,1))); % good
%% test2.cu
void mexFunction(int nlhs, mxArray * plhs[], int nrhs, const mxArray * prhs[])
{
    mxInitGPU();
    mxGPUArray const *a0 = mxGPUCreateFromMxArray(prhs[0]);
    double *d_a0 = (double*)mxGPUGetDataReadOnly(a0);
    plhs[0] = mxGPUCreateMxArrayOnCPU(a0);
    mxGPUDestroyGPUArray(a0);
}

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wei zhang 2021-3-12

在 MATLAB Online 中打开

It should be

mxSetCell(RESULT,i,mxDuplicateArray(R));

Sorry for using wrong format of copy array in cell format. It has nothing to do with the size.

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Is there a data size limited in the mex of cell format?

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Is there a data size limited in the mex of cell format?

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