File: lu_rightr.m

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ufsparse 1.2-7
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function [L,U] = lu_rightr (A)
n = size (A,1)
if (n == 1)
    L = 1 ;
    U = A ;
else
    u11 = A (1,1) ;							 % (7.4)
    u12 = A (1,2:n) ;							 % (7.5)
    l21 = A (2:n,1) / u11 ;						 % (7.6)
    [L22,U22] = lu_rightr (A (2:n,2:n) - l21*u12) ;			 % (7.7)
    L = [ 1 zeros(1,n-1) ; l21 L22 ] ;
    U = [ u11 u12 ; zeros(n-1,1) U22 ] ;
end