# Problems with double looping

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Armando MAROZZI il 8 Apr 2020
Modificato: Andrei Bobrov il 8 Apr 2020
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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### Risposta accettata

Andrei Bobrov il 8 Apr 2020
Modificato: Andrei Bobrov il 8 Apr 2020
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
##### 4 CommentiMostra 2 commenti meno recentiNascondi 2 commenti meno recenti
Andrei Bobrov il 8 Apr 2020
Modificato: Andrei Bobrov il 8 Apr 2020
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)'));
Armando MAROZZI il 8 Apr 2020
great! Thanks a lot!

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