Matrix whose elements are the colums numbers

Hi,

I need to create a 100*100 matrix with 3 conditions :

• elements on the diagonal are 0
• elements below the diagonal contain the column number
• elements above the diagonal contain the column number with minus sign

it may look simple but I am really new here so I hope someone could help me out :)

thanks in advance

Answer 1

[David Hill]

n=100;
[a,b]=ind2sub([n,n],1:n^2);
b(b==a)=0;
b(b>a)=-b(b>a);
c=reshape(b,[n,n]);

[Noa Prasquier]

thank you so much !

[David Hill]

If you a satisfied with the answer, you should accept it to close out the question.