How to add values to diagonal of a matrix

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Brock Eubanks
Brock Eubanks 2019-8-26
评论： David Hill 2019-8-26
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.

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回答（1 个）

David Hill
David Hill 2019-8-26
x=diag(1:6);
Is the diagonial matrix with 1:6 on the diagonal.
  2 个评论
Brock Eubanks
Brock Eubanks 2019-8-26
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
David Hill 2019-8-26
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?

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