code: public Matrix getS () {
  		Matrix X = new Matrix(n,n);
  		double[][] S = X.getArray();
  		for (int i = 0; i < n; i++) {
  			for (int j = 0; j < n; j++) {
  				S[i][j] = 0.0;
  			}
  			S[i][i] = this.s[i];
  		}
  		return X;
  	}
docs: Return the diagonal matrix of singular values
  @return     S