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[Octave-bug-tracker] [bug #42646] Error in implementation of logm
From: |
anonymous |
Subject: |
[Octave-bug-tracker] [bug #42646] Error in implementation of logm |
Date: |
Sun, 29 Jun 2014 19:05:52 +0000 |
User-agent: |
Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.114 Safari/537.36 |
URL:
<http://savannah.gnu.org/bugs/?42646>
Summary: Error in implementation of logm
Project: GNU Octave
Submitted by: None
Submitted on: Sun 29 Jun 2014 07:05:51 PM UTC
Category: Octave Function
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: None
Status: None
Assigned to: None
Originator Name: uhlmannj
Originator Email: address@hidden
Open/Closed: Open
Discussion Lock: Any
Release: 3.8.1
Operating System: Any
_______________________________________________________
Details:
The logm function fails for many types of matrix, e.g., any triangular matrix
of ones.
> M = tril(ones(2));
ans =
1 0
1 1
> logm(M)
warning: inverse: matrix singular to machine precision
ans =
0 0
0 0
M is nonsingular unit eigenvalues and thus has a logarithm, e.g.:
> expm([0 0; 1 0])
ans =
1 0
1 1
_______________________________________________________
Reply to this item at:
<http://savannah.gnu.org/bugs/?42646>
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