function [x, y, u, l ]=doolittle(A, B)
    n=size(A,1)
    A(2:n,1)=A(2:n,1)/A(1,1)
    for k=2:n-1,
        v=A(k,1:k-1)
        for j=k:n,
            w=A(1:k-1,j)
            A(k,j)=A(k,j)-v*w
        end
        w=A(1:k-1,k)
        for j=k+1:n,
        v=A(j,1:k-1)
                if A(k,k)==0 then
        mprintf("nilai x tidak terdefinisi karena pembaginya 0(nol)\n")
    end
        A(j,k)=(A(j,k)-v*w)/A(k,k)
        end
    end
    A(n,n)=A(n,n)-A(n,1:n-1)*A(1:n-1,n)
    l=tril(A,-1)+eye(n,n)
    u=triu(A)
    y=l\B
    x=u\y
        mprintf("nilai x dari persamaan Ax=B adalah")
    endfunction