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[Octave-bug-tracker] [bug #52999] Syntax change in eigs
From: |
Marco Caliari |
Subject: |
[Octave-bug-tracker] [bug #52999] Syntax change in eigs |
Date: |
Mon, 29 Jan 2018 03:45:48 -0500 (EST) |
User-agent: |
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0 |
URL:
<http://savannah.gnu.org/bugs/?52999>
Summary: Syntax change in eigs
Project: GNU Octave
Submitted by: caliari
Submitted on: Mon 29 Jan 2018 08:45:46 AM UTC
Category: Octave Function
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: Matlab Compatibility
Status: None
Assigned to: None
Originator Name:
Originator Email:
Open/Closed: Open
Discussion Lock: Any
Release: dev
Operating System: GNU/Linux
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Details:
>From R2017b, the syntax (and the underlying method) in eigs has changed
(although the old syntax is still supported)
https://uk.mathworks.com/help/matlab/ref/eigs.html?s_tid=gn_loc_drop
Fixing the syntax should not be difficult and should require only a
modification of eigs.m. The underlying method is now the Krylov-Schur
algorithm proposed by G. W. Stewart, which shares with ARPACK the Arnoldi
factorization and other ideas. I am aware only of this free toy
implementation
https://github.com/dingxiong/KrylovSchur
Due to the importance of the ARPACK package (used by octave, scilab, scipy, R,
...), I think that the right way to do could be an extension of the ARPACK
modes to include the new algorithm, or a fork to a KSPACK. In this way, all
the nice features already in ARPACK (single/double precision,
symmetric/unsymmetric/complex routines, reverse communication) would be kept.
Implementing from scratch the Krylov-Schur method in octave would be a huuuge
amount of work.
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