Nested loops- not entering the second loop?

m=2;
n=16;

A = zeros(m*n,m*n);
b = zeros(m*n,1);
%interior points

for i=2:n-1
    disp('first loop:');
    disp(i);
    for j=2:m-1 
        disp('second loop:');
        disp('im here!!');
        A(i*j,m-(i*j))= -4;
    end
end

first loop:

     2

first loop:

     3

first loop:

     4

first loop:

     5

first loop:

     6

first loop:

     7

first loop:

     8

first loop:

     9

first loop:

    10

first loop:

    11

first loop:

    12

first loop:

    13

first loop:

    14

first loop:

    15

I'm trying to populate A with values at certain indeces. For some reason, I am not able to even enter the second loop. I can't understand what's going on here, can someone help me?

[Torsten]

Since m=2, the second loop goes from 2 to 1, thus is never entered.

[Anu Raghunathan]

Oh my god thank you so much.... what a ridiculous error!! Thank you!