Three tasks in parallel

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John
John 2015-3-10
编辑： Christiaan 2015-3-11
If I have a 10x10x10 matrix A, and want to do some operations on three different dimensions separately, then how to do that in parallel? For example, I have to compute inverse of all 2D matrices in it, like:
for k=1:10
B(k,:,:)=inv(squeeze(A(k,:,:);
end
for k=1:10
B(:,k,:)=inv(squeeze(A(:,k,:);
end
for k=1:10
B(:,:,k)=inv(squeeze(A(:,:,k);
end
Now,I want to do the same thing, but three for-loops in parallel. Is there any way to do it in matlab? A help is greatly appreciated. Thanks.

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回答（1 个）

Christiaan
Christiaan 2015-3-11
编辑：Christiaan 2015-3-11
Dear John,
Parallel computation can be performed with the Parallel Computing Toolbox from Mathworks. To obtain the list of all the toolboxes on your license, can be done by typing 'ver' in your MATLAB prompt.
Here is an example how a code could look like:
tic
A = round(rand(3, 3, 3)*10);
parfor k = 1:3
B(k,:,:)=inv(squeeze(A(1,:,:)));
end
toc
If you have any problems with the toolbox, you may want to look at a previous answer first.
Note: for small computations the for command is faster then the parfor command. However if large calculations are performed, parfor will be faster .
Kind regards, Christiaan

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