matlab : sample cholesky program

A = [2 4 2; 4 11 4; 2 4 6]

j = 1
n = 3

while j <= n
        k = 1
        while k < j
                i = j
                while i <= n
                        A(i,j) = A(i,j) - A(i,k)*A(j,k)
                        i=i+1
                end
                k = k+1
        end
        A(j,j) = (A(j,j)).^(1/2)
        k = j+1
        while k <= n
                A(k,j) = (A(k,j))/(A(j,j))
                k = k+1
        end
        j = j+1
end
A