LU Decomposition MATLAB

%Please don't mess around with my code
clc;
R=input('How many variables are there in your system of linear equations? ');



clc;
disp ('Please enter the elements of the Coefficient matrix "A" and the Constant/Known matrix "B" starting from first equation');



A=zeros(R,R);

B=zeros(R,1);
for H=1:R

for i=1:R

fprintf ('Coefficient Matrix Column \b'), disp(i), fprintf ('\b\b Row \b'), disp(H);

I=input(' ');



A(H,i)=A(H,i)+I;
end

fprintf ('Known Matrix Row \b'), disp(H);

J=input(' ');



B(H,1)=B(H,1)+J;
end
clc;

[L,U] = lu(A);

Y = L\B;

X = U\Y;
fprintf ('The Coefficient Matrix "A" is \n'), disp(A);

fprintf ('The Constant/Known Matrix "B" is \n'), disp(B);

fprintf ('The Solution Matrix "X" is \n'), disp(X);