For loop in a for loop

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Jack Tse
Jack Tse 2021-3-26
评论： Jack Tse 2021-3-27
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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Rik
Rik 2021-3-26
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
Rik 2021-3-27
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
Jack Tse 2021-3-27
Thank you so much. It work prefectly fine.

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