1function [L,U] = lu_rightr (A) 2%LU_RIGHTR recursive right-looking LU. 3% Example: 4% [L,U] = lu_rightr (A) 5% See also: cs_demo 6 7% Copyright 2006-2012, Timothy A. Davis, http://www.suitesparse.com 8 9n = size (A,1) ; 10if (n == 1) 11 L = 1 ; 12 U = A ; 13else 14 u11 = A (1,1) ; % (6.4) 15 u12 = A (1,2:n) ; % (6.5) 16 l21 = A (2:n,1) / u11 ; % (6.6) 17 [L22,U22] = lu_rightr (A (2:n,2:n) - l21*u12) ; % (6.7) 18 L = [ 1 zeros(1,n-1) ; l21 L22 ] ; 19 U = [ u11 u12 ; zeros(n-1,1) U22 ] ; 20end 21