1function [L,U,P] = lu_rightp (A)
2%LU_RIGHTP right-looking LU factorization, with partial pivoting.
3%
4% Example:
5%   [L,U,P] = lu_rightp (A)
6% See also: cs_demo
7
8% Copyright 2006-2012, Timothy A. Davis, http://www.suitesparse.com
9
10n = size (A,1) ;
11P = eye (n) ;
12for k = 1:n
13    [x,i] = max (abs (A (k:n,k))) ;                           % partial pivoting
14    i = i+k-1 ;
15    P ([k i],:) = P ([i k], :) ;
16    A ([k i],:) = A ([i k], :) ;                              % (6.10), (6.11)
17    A (k+1:n,k) = A (k+1:n,k) / A (k,k) ;                               % (6.12)
18    A (k+1:n,k+1:n) = A (k+1:n,k+1:n) - A (k+1:n,k) * A (k,k+1:n) ;     % (6.9)
19end
20L = tril (A,-1) + eye (n) ;
21U = triu (A) ;
22