MATLAB PARALLEL COMPUTING TOOLBOX - S Guia do Utilizador descarregar pdf (Página 350)

100

101

11 Functions — Alphabetical List

11-6

R2 = rand(2,1,4,3,'gpuArray');

R3 = rand(1,5,4,3,'gpuArray');

R = arrayfun(@(x,y,z)(x+y.*z),R1,R2,R3);

size(R)

2 5 4 3

R1 = rand(2,2,0,4,'gpuArray');

R2 = rand(2,1,1,4,'gpuArray');

R = arrayfun(@plus,R1,R2);

size(R)

2 2 0 4

• Because the operations supported by arrayfun are strictly element-wise, and each

element’s computation is performed independently of the others, certain restrictions

are imposed:

• Input and output arrays cannot change shape or size.

• Functions like rand do not support size specifications. Arrays of random numbers

have independent streams for each element.

For more limitations and details, see “Tips and Restrictions” on page 9-17.

Examples

If you define a MATLAB function as follows:

function [o1,o2] = aGpuFunction(a,b,c)

o1 = a + b;

o2 = o1 .* c + 2;

You can evaluate this on the GPU.

s1 = gpuArray(rand(400));

s2 = gpuArray(rand(400));

s3 = gpuArray(rand(400));

[o1,o2] = arrayfun(@aGpuFunction,s1,s2,s3);

whos

Name Size Bytes Class

o1 400x400 108 gpuArray

1 2 ... 345 346 347 348 349 350 351 352 353 354 355 ... 655 656

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