Parallel programming and parfor

2015 5 30
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更新时间：2015 6 2
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I have a couple of questions. what is sliced variable? please bring a clear example. How should use parfor when you have a for inside another for loop?
Thanks

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Walter Roberson
Walter Roberson 2015-5-30

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Mohammad
Mohammad 2015-6-1
编辑：Mohammad 2015-6-1
Example - How do use sliced variable in
CE=c./(absXini);
for i=1:m1
CE(i,i)=0;
end
if you want to see errors, simply add 'par' before for and read errors in details.
Walter Roberson
Walter Roberson 2015-6-2
The documentation there makes clear that the loop index may only appear once in the indexing expression; your code tries to use it twice.
Equivalent code that can be run with parfor, presuming a square 2D array
for i = 1 : size(CE,1)+1 : (m1-1)*size(CE,1)+m1
CE(i) = 0;
end
Other equivalent:
t = zeros(m1,1);
for i = 1 : m1
t(i) = 0; %redundant in the case of 0
end
CE(1:size(CE,1)+1:(m1-1)*size(CE,1)+m1) = t; %must be outside
And there is the vector version (not usable inside parfor)
CE(sub2ind(size(CE),1:m1,1:m1)) = 0;
Some of these can be simplified for the case where m1 is the same as size(CE,1) and the matrix is square, including
CE = CE - diag(diag(CE));

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