In C++/mex file, will the changes in memory in C be automatically reflected in Matlab

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Yizhi 2014-8-6

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https://ww2.mathworks.cn/matlabcentral/answers/146589-in-c-mex-file-will-the-changes-in-memory-in-c-be-automatically-reflected-in-matlab

评论： Adam 2014-8-7

Hello, I am kind of new to the mex functions. If I use the mxGetData to get the pointer to the array and I change the value in the memory of that array, do I still need to make a copy of values using some mxfunctions and return it to matlab？ Or I need to do nothing and the value in Matlab will automatically change?

In other words, if we pass values to cpp using mxFunctions, do they do a shadow copy or a deep copy?

To make the question clear, here is an example C code:

 float * temp_data = (float*) mxGetData(prhs[0]);//at this time, temp_data[0] = 0
 temp_data[0] = 1;

If I don't do anything to return the temp_data, will the value in matlab be changed?

Thank you.

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Adam 2014-8-7

I'm afraid I don't know the answer off-hand, though I assume if you already have your mex program setup you could verify one way or the other in a few seconds yourself?

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