problems with @arrayfun on GPU

Question

christian Velasquez Javier 2022-8-2

1
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1772690-problems-with-arrayfun-on-gpu

回答： Joss Knight 2022-8-8

Hi,

I am starting to using the arrafun function with GPU capabilities (I have an NVIDIA GeForce GTX 1650 with Max-Q Design).

I am following jsut the example from matlab website

    R1 = rand(2,5,4,"gpuArray");
    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);

The code above runs perfectly in the Command Window, but if I want to run this from an script or live-script I get the following error:

Index exceeds the number of array elements. Index must not exceed 0.

Some hint what is happening?

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Walter Roberson 2022-8-2

What name did you use for the script?

christian Velasquez Javier 2022-8-2

Hi Walter, I used newd.m as name

I've just realized what is the problem. Apparently arrayfun for gpuArrays works in an script .m but not in a .mlx. Moreover, to run in the script scope you need to run the whole script (F5), because when I tried to run a especific section (Ctrl+Enter) the code gives an error

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Answer 1

Joss Knight 2022-8-8

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1772690-problems-with-arrayfun-on-gpu#answer_1022805

在 MATLAB Online 中打开

This is a bug. I have reported it. Thanks for finding it!

In the meantime, you can work around the issue by using a local function rather than an anonymous function.

R1 = rand(2,5,4,"gpuArray");
R2 = rand(2,1,4,3,"gpuArray");
R3 = rand(1,5,4,3,"gpuArray");
R = arrayfun(@iFunc,R1,R2,R3);
function w = iFunc(x,y,z)
w = x+y.*z;
end