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[Octave-bug-tracker] [bug #41399] The LU decomposition does not return a

From: John W. Eaton
Subject: [Octave-bug-tracker] [bug #41399] The LU decomposition does not return a lower triangular L
Date: Thu, 30 Jan 2014 06:03:32 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130917 Firefox/17.0 Iceweasel/17.0.9

Update of bug #41399 (project octave):

                  Status:                    None => Invalid                
             Open/Closed:                    Open => Closed                 


Follow-up Comment #1:

>From the docstring for lu:

Compute the LU decomposition of A.  If A is full subroutines from
LAPACK are used and if A is sparse then UMFPACK is used.  The
result is returned in a permuted form, according to the optional
return value P.


With two output arguments, returns the permuted forms of the upper
and lower triangular matrices, such that 'A = L * U'.  With one
output argument Y, then the matrix returned by the LAPACK routines
is returned.

This behavior is required for compatibility with Matlab.


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