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

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?

Answer 1

[Edric Ellis]

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.

[Jacob Lynch August]

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.

Answer 2

[KSSV]

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

[Kevin]

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.

[Jacob Lynch August]

Alternatively:

complex(gpuArray.rand(size,type),gpuArray(size,type))