Why numel() is not accepted with a gpuArray

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Song Decn
Song Decn 2022-9-14
评论： Song Decn 2022-9-18
pcGpu = gpuArray(5:100);
r = arrayfun( @numel, pcGpu );
simple line of code above, although numel is supported with gpuArray, I still get following feedback:
Function passed as first input argument contains unsupported or unknown function 'numel'.
For more information see Tips.
Am I doing sth. wrong?
Thanks, Song
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Walter Roberson
Walter Roberson 2022-9-15
Are you applying numel to the entire array, or are you applying numel to each element of an array? When you use arrayfun then by definition the function is passed one element of the array.
arrayfun over a gpuArray does not support anonymous functions with captured variables.
Walter Roberson
Walter Roberson 2022-9-15
for i = 1:numel(a)
f = pcGpu + i;
end
That overwrites all of f each iteration, so if you could get it to work, the result would be the same as if you had done
i = numel(a);
f = pcGpu + numel(a);
Reminder: you can pass numel(a) in as a parameter.

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采纳的回答

Walter Roberson
Walter Roberson 2022-9-15
编辑：Walter Roberson 2022-9-15
https://www.mathworks.com/help/parallel-computing/gpuarray.arrayfun.html
numel is not supported inside any function run on a gpuArray by using arrayfun. The above link lists all supported functions.
Remember that arrayfun on a gpuArray runs all aspects on the gpu. Variables not specifically configured as gpuArray have to be converted to gpuArray internally because the entire function runs on the gpu.

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