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

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Kevin
Kevin 2017-9-12
评论： Jacob Lynch August 2018-11-9
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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采纳的回答

Edric Ellis
Edric Ellis 2017-9-12
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.
  1 个评论
Jacob Lynch August
Jacob Lynch August 2018-11-9
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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更多回答（1 个）

KSSV
KSSV 2017-9-12
G = gpuArray(rand(10,1)+1i*rand(10,1));
  2 个评论
Kevin
Kevin 2017-9-12
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.

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