Using the diag and commands!

So apparently, I can not use the diag and fliplr commands in my program. I have to actually have the program execute the same things just not using those commands. So I am thinking a for loop will need to be used then, but I do not know how. It will always be a 4 x 4 matrix that is stored in MS if that helps.

    x=sum(MS);
    y=sum(MS');
    z=diag(MS);
    p=diag(fliplr(MS));

So that is what I had, but I need to change the z and p without using diag and fliplr, and I need to get the same matrix!

Any help is appreciated!

Answer 1

[Walter Roberson]

Hint: if you have N rows, then the elements on the diagonal are (N+1) elements apart.

[Ryan]

ok well I got that part now. This is how I did it:

   [ll]=length(MS);
for i=1:1:ll
   z1(i,i)  = MS(i,i);
   z2 = z1(z1~=0);
end

But I can't figure out how to get the opposite diagnols now without using the fliplr command. I've tried switching the i=1:1:ll, to i=ll:-1:1, or something like that. How would I do this part now?

[Walter Roberson]

What is z2, and why are you overwriting it on each iteration? And what if there is a 0 on the diagonal ?

Your variable name "ll" looks like the number 11 :(

Hint: if you have N rows, then the elements on the opposite diagonal are (N-1) elements apart.