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[Octave-bug-tracker] [bug #46103] inversion of a singular diagonal matri
From: |
jan |
Subject: |
[Octave-bug-tracker] [bug #46103] inversion of a singular diagonal matrix A produces inv(A)==A |
Date: |
Fri, 02 Oct 2015 09:51:37 +0000 |
User-agent: |
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:41.0) Gecko/20100101 Firefox/41.0 |
URL:
<http://savannah.gnu.org/bugs/?46103>
Summary: inversion of a singular diagonal matrix A produces
inv(A)==A
Project: GNU Octave
Submitted by: pfa
Submitted on: fre 2 okt 2015 09.51.36
Category: Libraries
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: Incorrect Result
Status: None
Assigned to: None
Originator Name:
Originator Email:
Open/Closed: Open
Discussion Lock: Any
Release: 4.0.0
Operating System: GNU/Linux
_______________________________________________________
Details:
Inverting (with inv) a singular diagonal matrix results the
matrix itself, but mrdivide and mldivide act correctly.
This bug affects also at least version 3.8.2. (from ubuntu 15.04. packaging.)
>> version
ans = 4.0.0
>> w=diag(0:2); id=eye(3); inv(w), w\id, id/w
warning: matrix singular to machine precision, rcond = 1
ans =
Diagonal Matrix
0 0 0
0 1 0
0 0 2
ans =
Diagonal Matrix
0.00000 0 0
0 1.00000 0
0 0 0.50000
ans =
Diagonal Matrix
0.00000 0 0
0 1.00000 0
0 0 0.50000
>>
_______________________________________________________
Reply to this item at:
<http://savannah.gnu.org/bugs/?46103>
_______________________________________________
Meddelandet skickades via/av Savannah
http://savannah.gnu.org/
- [Octave-bug-tracker] [bug #46103] inversion of a singular diagonal matrix A produces inv(A)==A,
jan <=
- [Octave-bug-tracker] [bug #46103] inversion of a singular diagonal matrix A produces inv(A)==A, Mike Miller, 2015/10/08
- [Octave-bug-tracker] [bug #46103] inversion of a singular diagonal matrix A produces inv(A)==A, Rik, 2015/10/08
- [Octave-bug-tracker] [bug #46103] inversion of a singular diagonal matrix A produces inv(A)==A, jan, 2015/10/08
- [Octave-bug-tracker] [bug #46103] inversion of a singular diagonal matrix A produces inv(A)==A, jan, 2015/10/08
- [Octave-bug-tracker] [bug #46103] inversion of a singular diagonal matrix A produces inv(A)==A, Rik, 2015/10/08
- [Octave-bug-tracker] [bug #46103] inversion of a singular diagonal matrix A produces inv(A)==A, jan, 2015/10/08
- [Octave-bug-tracker] [bug #46103] inversion of a singular diagonal matrix A produces inv(A)==A, Mike Miller, 2015/10/08
- [Octave-bug-tracker] [bug #46103] inversion of a singular diagonal matrix A produces inv(A)==A, jan, 2015/10/08
- [Octave-bug-tracker] [bug #46103] inversion of a singular diagonal matrix A produces inv(A)==A, Rik, 2015/10/08
- [Octave-bug-tracker] [bug #46103] inversion of a singular diagonal matrix A produces inv(A)==A, Mike Miller, 2015/10/08