Function that returns an NxN matrix

I need to create a function that when a value for N is entered it returns an NxN identity matrix. But this needs to be done without employing Matlab commands which operate on entire matrices, rows, and columns.

[Andrei Bobrov]

in MATLAB without employing Matlab commands - how?

[Stephen23]

All functions require MATLAB commands, starting with the function function.

Answer 1

[Andrei Bobrov]

for jj = N:-1:1
    out(jj,jj) = 1;
end

[Stephen23]

This uses multiple MATLAB functions: for , colon , end ,...

[Andrei Bobrov]

Hi Stephen! I agree with you.

[Michael]

So I tried this in matlab and no matter what value you enter for N it displays a 4x4 identity matrix.

[Stephen23]

Andrei Bobrov: I like the array preallocation through the reversed sequence. That is a nice touch!

[Andrei Bobrov]

Hi Stephen! This is idea by Jan Simon.