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 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?

Nested loops- not entering the second loop?

2 次查看（过去 30 天）

Anu Raghunathan 2021-12-11

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1608955-nested-loops-not-entering-the-second-loop

评论： Anu Raghunathan 2021-12-11

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?