Problems with double looping

Question

0 个投票

I am trying to implement this double loop. There is lot of material online on double looping in matlab but I don't manage to make it work.

This is my code:

debt = nan(49,1)
for j = -(6:12)
    for i = 2:8
         debt(j, i) = ((1 + 0.93) - (1 + j)) + 134.77 + (i - 3.3)
    end
end

I would like to be able to save debt as a 49x1 vector.

What's wrong with my loop?

Thanks

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Answer 1

Andrei Bobrov 2020-4-8

编辑：Andrei Bobrov 2020-4-8

0 个投票

Just:

ii = 2:8;
jj = -(6:12);
debt = 132.4 - jj(:) + ii(:)';
debt = debt(:);

or with for-loop:

ii = 2:8;
jj = -(6:12);
debt = nan(7);
for j = 1:7
    for i = 1:7
         debt(j, i) = 132.4 - jj(j) + ii(i);
    end
end

Andrei Bobrov 2020-4-8

编辑：Andrei Bobrov 2020-4-8

Variant:

ii = 2:8;
jj = -(6:12);
[j,i] = ndgrid(jj,ii);
debt = 132.4 - j(:) + i(:);

other

n = 7;
ii = (2:8)';
jj = -(6:12)';
debt = 132.4 - jj(kron((1:n)',ones(n,1))) + ii(kron(ones(n,1),(1:n)'));

great! Thanks a lot!