For loop in a for loop

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Jack Tse 2021-3-26

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/784746-for-loop-in-a-for-loop

评论： Jack Tse 2021-3-27

采纳的回答： Rik

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I am writing a for loop with two data set A and B as the following:

for k = 1:5
    for i = 12*k
        b = nan(5,10)
        for j = 1:10
            a = regress(A(i-11:i,j),B(i-11:i,1))
            b(k,j) = a(2:end)
        end
    end
end

I want to store all the result in one data set. However, only data with k = 5, i =5 is store into b. Any idea why this might happen?

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madhan ravi 2021-3-26

i is a scalar

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采纳的回答

Rik 2021-3-26

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/784746-for-loop-in-a-for-loop#answer_659541

You are resetting b in your loop, so only the last value of k matters.

And the middle loop isn't a loop, as it is a scalar.

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Rik 2021-3-27

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By putting the code that assigns a value to b (without taking into account any existing value of b) outside the loop.

b = nan(5,10);
for k = 1:5
    i = 12*k;
    for j = 1:10
        a = regress(A(i-11:i,j),B(i-11:i,1));
        b(k,j) = a(2:end);
    end
end
disp(b)

Jack Tse 2021-3-27

Thank you so much. It work prefectly fine.

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