Write a MATLAB code to find the L and U decompostions of a matrix

I cannot use the MATLAB built in functions to find the Lower Triangle and Upper Triangle decompositions of a matrix that would solve this easily. I have to write my own. This is what I have so far but now I don't know what to do next.

function [ L1 U1 ] = LUdecomp( A )
%UNTITLED3 Summary of this function goes here
%   Detailed explanation goes here

AA = A;
n = n1;
L = zeros(n1,n2);
U = zeros(n1,n2);
m = 1;
while n~=0;
    alpha = AA(1,1);
    v = AA(2:n,1);
    w = AA(1,2:n);

end

Answer 1

[Udoi]

To decompose a matrix into lower and upper and lower triangular matrices,we can use the following syntax:

[LU,P] = step(lu,A)
[LU,P,S] = step(lu,A)

[LU,P] = step(lu,A) decomposes the matrix A into lower and upper triangular matrices. The output LU is a composite matrix with lower triangle elements from L and upper triangle elements from U . The permutation vector P is the second output.

[LU,P,S] = step(lu,A) returns an additional output S indicating if the input is singular when the ExceptionOutputPort property is set to true.

For more information,follow the link:https://in.mathworks.com/help/dsp/ref/dsp.lufactor.step.html