nested for loops don't work

I have a problem with this piece of code with nested for loops:

for k=1:6
  matrix=zeros(3,3,6);
  for i=1:3
      for j=1:3
          matrix(i,j,k)=i+j+k;
      end
  end
          matrix(:,:,k)
end
matrix

Don't pay attentio to matrici(i,j,k)=i+j+k; It's just a way to fill the matrix. The problem is that: when I print matrix(:,:,k), they appears correctly. But when I print matrix at the end of code, only matrix(:,:,6) is correctly filled. The others are alla zeros. I can't understand where the mistake is. Thanks

Answer 1

[Andrei Bobrov]

matrix=zeros(3,3,6);
for k=1:6
    for i=1:3
        for j=1:3
            matrix(i,j,k)=i+j+k;
        end
    end
end
matrix

[RD]

What a silly mistake I made!