A=U*S*V', A is m by n, U is m by m, S is a vector to store diagnal elements of matrix of size min(m,n), V is n by n, it's the same as Matlab
A=U*S*V', A is m by n, U is m by m, S is a vector to store diagnal elements of matrix of size min(m,n),V is n by n, it's the same as Matlab