How can I return the values of a loop

I want to return the entire values of k matrice but I only end up with values from the last row.

for i = 1:5,
  j = 0:i;
  k = i.^2 + i*j + j.^2
end

Answer 1

[Felix Lauwaert]

You are computing k once for each value of i and overwriting it. If I understand what you want, try:

 i = 1:5;
 j = 0:5;
 k = zeros(numel(i),numel(j));
 for a = 1:numel(i)
     for b = 1:numel(j)
         k(a,b) = i(a)^2 + i(a)*j(b) + j(b)^2;
     end
 end
 display(k)

[zaxtronix]

Thanks a lot man, how did you do it using this numel function, I definitely wouldn't have been able to come about it.

Answer 2

[Andrei Bobrov]

n = 5;
k = tril(((1:n)'*ones(1,n+1)).^2+(1:n)'*(0:n)+(ones(n,1)*(0:n)).^2,1);

with for..end loop

n = 5;
k = zeros(n,n+1);
for ii = 1:5,
  jj = 0:ii;
  k(ii,1:ii+1) = ii.^2 + ii*jj + jj.^2;
end

[zaxtronix]

thanks, this also works perfectly, except doing an extraction will require one dealing with zeros in the array

[Andrei Bobrov]

hm...

[ii,jj] = ndgrid(1:5,0:5);
k = ii.^2 + ii.*jj + jj.^2;