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[Octave-bug-tracker] [bug #41399] The LU decomposition does not return a
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From: |
John W. Eaton |
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Subject: |
[Octave-bug-tracker] [bug #41399] The LU decomposition does not return a lower triangular L |
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Date: |
Thu, 30 Jan 2014 06:03:32 +0000 |
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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
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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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