For loop in a for loop

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?

[madhan ravi]

i is a scalar

Answer 1

[Rik]

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.

[Jack Tse]

Thank you.

How can I avoid resetting b in my loop?

[Rik]

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]

Thank you so much. It work prefectly fine.