Problems with double looping

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

Answer 1

[Andrei Bobrov]

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

[Armando MAROZZI]

If I run that code I get again just the last value stored in debt. It doesn't create a 49x1 vector, does it?

[Armando MAROZZI]

Andrei, I guess I explained myself not clearly in the question. With your codes I get a 7x7 matrix. I need to be stored as a 49x1 vector. What to put in deb(?,?) in this case? Thanks a lot

[Andrei Bobrov]

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]

great! Thanks a lot!