How to add values to diagonal of a matrix

k=1;

n=6;

for i=1:6

for j=1:6

A(i,j)=?

I need to have values in the diagonal going from 1:6 but I keep getting an error.

Answer 1

[David Hill]

x=diag(1:6);

Is the diagonial matrix with 1:6 on the diagonal.

[Brock Eubanks]

that gives me an error, where the size of the left one is 1-by-1 and the size of the right one is 6-by-6. I just thought you could add a 1 to k each time for C11, C22, etc. to get 1, 2, 3, 4, 5, 6 for the main diagonal.

[David Hill]

I am not sure what you want to do, but why not just change your input?

k=zeros(6);
k(1,1)=1;
x=diag(1:6);
k+x;

Yes, the sizes need to be the same, but why not just add zeros to match the size?