Vectorization of 3 nested for loops.

Question

Emiliano Rosso 2015-9-6

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/240346-vectorization-of-3-nested-for-loops

评论： Emiliano Rosso 2015-9-7

采纳的回答： per isakson

在 MATLAB Online 中打开

I have 3 for loop and I want to vectorized it .

I try a lot to do it but I cannot do it.

This is the simple version.

I can't explain the whole situation but:

A is 100*82.

B is 203*2000.

C is 1*10.

D is 100*5*2000.

for nset=1:100
    for nindy=1:5
        for nimp=1:2000
if A(nset,2+(nindy-1).*3)==1
    if B(33.*6+nindy,nimp)<= C(1+(nindy-1).*2)+...
        ((C(2+(nindy-1).*2)-C(1+(nindy-1).*2))./11).*A(nset,1+(nindy-1).*3)
         D(nset,nindy,nimp)=1;
      end
  end
         end
      end
  end

I want to replace the 3 for loops with vectorization...

Thanks....

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Answer 1

per isakson 2015-9-6

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/240346-vectorization-of-3-nested-for-loops#answer_191487

编辑：per isakson 2015-9-6

在 MATLAB Online 中打开

I don't think that your code can be vectorized. However, this should be a bit faster

for nset=1:100
    for nindy=1:5
        if A(nset,2+(nindy-1).*3)==1
            C17 = C(1+(nindy-1).*2)        ...
                + ((C(2+(nindy-1).*2)-C(1+(nindy-1).*2))./11).*A(nset,1+(nindy-1).*3);
            for nimp=1:2000
                if B(33.*6+nindy,nimp) <= C17
                    D(nset,nindy,nimp) = 1;
                end
            end
        end
    end
end