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[Octave-bug-tracker] [bug #59486] p variable not always defined in eigs
From: |
JD |
Subject: |
[Octave-bug-tracker] [bug #59486] p variable not always defined in eigs function |
Date: |
Thu, 19 Nov 2020 12:48:25 -0500 (EST) |
User-agent: |
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:83.0) Gecko/20100101 Firefox/83.0 |
URL:
<https://savannah.gnu.org/bugs/?59486>
Summary: p variable not always defined in eigs function
Project: GNU Octave
Submitted by: jdbancal
Submitted on: Thu 19 Nov 2020 05:48:24 PM UTC
Category: Octave Function
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: Regression
Status: None
Assigned to: None
Originator Name:
Originator Email:
Open/Closed: Open
Release: 6.0.92
Discussion Lock: Any
Operating System: GNU/Linux
_______________________________________________________
Details:
When computing just a few eigenvalues of a matrix, Matlab supports two
syntaxes (see https://fr.mathworks.com/help/matlab/ref/eigs.html ):
A = eye(5);
eigs(A, 1)
as well as
A = eye(5);
eigs(A, [], 1)
The second format allows to disambiguate between standard and generalized
eigenvalue decompositions (this is not obvious when the first argument is a
scalar for instance). Namely, an empty second argument here makes it clear
that we are interested in the standard eigenvalue decomposition, even when the
dimension of the first argument 'A' happens to be of dimension 1x1, i.e. a
scalar.
The second syntax was supported in previous versions of Octave (4.2 for
instance), but it gives an error on the newest versions, including Octave 6:
error: 'p' undefined near line 231 column 11
error: called from
eigs at line 231 column 7
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- [Octave-bug-tracker] [bug #59486] p variable not always defined in eigs function,
JD <=
- [Octave-bug-tracker] [bug #59486] p variable not always defined in eigs function, Rik, 2020/11/19
- [Octave-bug-tracker] [bug #59486] p variable not always defined in eigs function, Markus Mützel, 2020/11/20
- [Octave-bug-tracker] [bug #59486] p variable not always defined in eigs function, Markus Mützel, 2020/11/20
- [Octave-bug-tracker] [bug #59486] p variable not always defined in eigs function, Rik, 2020/11/20
- [Octave-bug-tracker] [bug #59486] p variable not always defined in eigs function, John W. Eaton, 2020/11/20
- [Octave-bug-tracker] [bug #59486] p variable not always defined in eigs function, Markus Mützel, 2020/11/20
- [Octave-bug-tracker] [bug #59486] p variable not always defined in eigs function, Rik, 2020/11/20
- [Octave-bug-tracker] [bug #59486] p variable not always defined in eigs function, JD, 2020/11/25