Fast question!

Hi all,

How do I make this matrix in Matlab?

http://dl.dropbox.com/u/9726875/matrix.png

Thanks

[Image Analyst]

Fast comment - what number should be in the blank areas?

Answer 1

[Walter Roberson]

If the output matrix is to be n by n, then

M = diag(ones(m-1,1),1) + diag(-ones(m-1,1),-1) + diag(1,1-n) + diag(1,n-1);

[Walter Roberson]

There are faster ways using ordinary assignments.