how to get 2 outputs of my function?

function [L,R]= LR(A)
R=A;
L=eye(size(A,1));
n=size(A,1);
for j=1:n-1
    for i=(j+1):n
        L(i,j)=R(i,j)/R(j,j);
        R(i,:)=R(i,:)-L(i,j)*R(j,:);
    end
end
end

Hi, i acually do not really understand, why I am only getting L, but not R,

Answer 1

[Star Strider]

The reason is likely the way you are calling your ‘LR’ funciton.

If you request both outputs, your function will deliver them:

A = ... ;
[L,R] = LR(A)

That call should return both outputs.

[tim123]

if I first create a matrix A and then use

[L,R] = LR(A)

somehow I just get an error, if i just understood it right.

[tim123]

k I forgot to change a mistake in my code, that i changed. It works!

[Star Strider]

You didn’t state the matrix you are using as an argument, or what output you want from your funciton.

This works when I run it:

A = magic(4);
[L,R]= LR(A)

returning:

L =
            1            0            0            0
       0.3125            1            0            0
       0.5625      0.56627            1            0
         0.25       1.3012           -3            1

R =
           16            2            3           13
            0       10.375       9.0625       3.9375
            0  -8.8818e-16     -0.81928       2.4578
            0  -2.6645e-15            0  -2.6645e-15

Your function may only work for square matrices. If that is the case, you need to test for that, and return the appropriate outputs from your function, including an error condition and notification if the matrix argument is not square.