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How to set all one gpuArray in mex?

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wei zhang
wei zhang on 16 Feb 2021
Answered: Edric Ellis on 16 Feb 2021
Hi,
I need to set a all-one double gpuArray. I think I could use mxGPUCreateGPUArray to initial it. But it seems mxGPUCreateGPUArray could only initial a all-zero array like below.
mxGPUArray *x = mxGPUCreateGPUArray(ndim, dims, mxDOUBLE_CLASS, mxREAL, MX_GPU_INITIALIZE_VALUES);
Is there any good way to do this? Do I need to write a kernel function to do it with cuda function? Thank you.

Accepted Answer

Edric Ellis
Edric Ellis on 16 Feb 2021
You basically have two options: either create and uninitialized mxGPUArray and fill the values using CUDA code (either a kernel, or one of the cuMemset* variants if your data type is small enough), or pass in to your MEX function an array of ones that you create in MATLAB using ones(...,'gpuArray').

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