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9 GPU Computing

Ga = rand(1000,'single','gpuArray');

Gfft = fft(Ga);

Gb = (real(Gfft) + Ga) * 6;

G = gather(Gb);

The whos command is instructive for showing where each variable's data is stored.

Name Size Bytes Class

G 1000x1000 4000000 single

Ga 1000x1000 108 gpuArray

Gb 1000x1000 108 gpuArray

Gfft 1000x1000 108 gpuArray

Notice that all the arrays are stored on the GPU (gpuArray), except for G, which is the

result of the gather function.

Sparse Arrays on a GPU

The following functions support sparse gpuArrays.

classUnderlying

gpuArray.speye

isaUnderlying

You can create a sparse gpuArray either by calling sparse with a gpuArray input, or by

calling gpuArray with a sparse input. For example,

x = [0 1 0 0 0; 0 0 0 0 1]

s = sparse(x)

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