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Kevin
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How do I construct a complex gpuArray directly on the GPU?

Asked by Kevin
on 12 Sep 2017
Latest activity Commented on by Jacob Lynch August on 9 Nov 2018
I am trying to initialize a complex gpuArray directly on the GPU (i.e. without first creating a complex array in host memory and then copying it over to the device).
So far the only thing I've found that works is:
foo = gpuArray(complex(0));
bar = zeros(4, 1, 'like',foo);
which seems kinda silly. Is there a way to allocate a complex gpuArray directly using something like gpuArray.zeros?

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2 Answers

Answer by Edric Ellis
on 12 Sep 2017
 Accepted Answer

None of MATLAB's build methods (the zeros, ones family) build complex arrays, so the nearest you can get is to do something like:
complex(zeros(3, 'gpuArray'))
which never allocates any host memory, and results in a complex gpuArray.

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What about elements on the host that need to be transferred to the GPU, like
G = complex( gpuArray(V(:,1)), gpuArray(:,2) );
It seems silly to me to have those two temporary gpuArrays.

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Answer by KSSV
on 12 Sep 2017

G = gpuArray(rand(10,1)+1i*rand(10,1));

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Unfortunately, this still allocates memory on the host first and then copies it over to the GPU device. I would like to initialize the array directly on the GPU.
Alternatively:
complex(gpuArray.rand(size,type),gpuArray(size,type))

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