[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Octave-bug-tracker] [bug #52593] qr(A, 'matrix') and qr(A, 'vector') re

From: Joseph Young
Subject: [Octave-bug-tracker] [bug #52593] qr(A, 'matrix') and qr(A, 'vector') return the wrong result with a tall skinny matrix
Date: Wed, 6 Dec 2017 17:49:44 -0500 (EST)
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:57.0) Gecko/20100101 Firefox/57.0

Follow-up Comment #4, bug #52593 (project octave):

Hi, Rik.  Thanks for taking a look at this.  I would contend that it's
partially a MATLAB compatibility issue, but the result for  [Q R
p]=qr(A,'matrix') is actually incorrect.  Octave returns a permutation vector
p when a matrix is explicitly requested.  I would call returning an economy
sized factorization for [Q R p]=qr(A,'vector') when MATLAB returns the full
factorization a compatibility issue.

Anyway, maybe it's not a big deal in how it's categorized, but I wanted to
bring this up in case there's a difference in how and when issues are
prioritized internally.  At the end of the day, I think the same bit of code
will end up fixing both bugs.


Reply to this item at:


  Message sent via/by Savannah

reply via email to

[Prev in Thread] Current Thread [Next in Thread]