My code is:

function my_inverse

rand('seed',5542)

A=rand(100);

B=zeros(100);

%%%%%%%%%%%%%%%%%%%%%%%%%%

%Find A^-1 and store in B

I NEED THIS PART.........

%%%%%%%%%%%%%%%%%%%%%%%%%%%

I=eye(100);

C=abs(A*B-I);

disp('max entry in |AB-I|')

max(max(C)

B=inv(A);

C=abs(A*B-I);

disp('max entry in |AB-I|,where B is found using a MATLAB built function')

C=max(max(C);

Could you please help me to complete my code on Matlab to calculate the inverse of a matrix by using these functions

function x=ut_sys(U,d)

function d=ult_sys(L,c)

function c=perm_b(b,p)

and LU=A