text: function [V,Beta,R] = qr_right (A)
  %QR_RIGHT right-looking Householder QR factorization.
  % Example:
  %   [V,Beta,R] = qr_right (A)
  % See also: cs_demo
  
  % Copyright 2006-2012, Timothy A. Davis, http://www.suitesparse.com
  
  [m n] = size (A) ;
  V = zeros (m,n) ;
  Beta = zeros (1,n) ;
  for k = 1:n
      [v,beta] = gallery ('house', A (k:m,k), 2) ;
      V (k:m,k) = v ;
      Beta (k) = beta ;
      A (k:m,k:n) = A (k:m,k:n) - v * (beta * (v' * A (k:m,k:n))) ;
  end
  R = A ;
  