How do I change the values of diag(matrix) ?

Hello!

I am wondering why I cant change the values of diag(matrix) to different values.

>> matrix =

3 0 0

0 4 0

0 0 5

>> diag(matrix) = 5;

What I am trying to do with that code is change the values 3, 4, 5 in the matrix to all have the value 5. But it does not work.

How can I make this work?

Thanks in advance!

Answer 1

[Image Analyst]

Try this (using eye() to get a mask of the diagonal elements):

matrix = [...
    3     0     0
    0     4     0
    0     0     5]
diagonalMask = logical(eye(size(matrix)))
matrix(diagonalMask) = 5

[abbyeit]

Thanks!