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

From: anonymous
Subject: [Octave-bug-tracker] [bug #41399] The LU decomposition does not return a lower triangular L
Date: Thu, 30 Jan 2014 02:37:59 +0000
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/32.0.1700.102 Safari/537.36


                 Summary: The LU decomposition does not return a lower
triangular L
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Thu 30 Jan 2014 02:37:57 AM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: Donald
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.6.4
        Operating System: Microsoft Windows



N=10; A=eye(N)+diag(1:(N-1),1) + diag(1:(N-1),-1);
min(diag(L,0)) --> returns zero???
diag(L,3) --> returns -0.5???
sum(~~L(2,:))--> return 9???, row at index=2 is almost full???
max(max(abs(A-L*U))) --> returns 4.9960e-016 as it should be.


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