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[Octave-bug-tracker] [bug #36211] bug: crashes and endless loops
From: |
anonymous |
Subject: |
[Octave-bug-tracker] [bug #36211] bug: crashes and endless loops |
Date: |
Tue, 17 Apr 2012 09:52:58 +0000 |
User-agent: |
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:11.0) Gecko/20100101 Firefox/11.0 |
Follow-up Comment #2, bug #36211 (project octave):
Hello, thanks for investigating this issue,
I'm using the "i686-pc-mingw32" version of 3.6.1.
yes, I know my statements are somewhat nonsensical :) - I just wanted to
create a tiny example. As far as I can see, the loop (or crash) occurs on
(every?) equation systems where the matrix contains any Inf value.
I was doing curve fitting with a Gauss-Newton like algorithm (see below) that
did not converge, so that after a few iterations there where Inf values in the
equation system.
F = f(X,a); % F: function values
% a: vector of parameters
% X,Y: Nx1-matrices with measurement data (N is about 20000)
r = F-Y; % residuals
J = jac(X,a); % jac: function that forms jacobi-matrix
% (here I should check if there are Inf values in J ...)
s = J r; % crash...
a -= s;
% (...iterate until algorithm converges...)
It seems that if the Inf value is in the first column, then it crashes (or on
linux: shows the expected error message). If the Inf is in a column >1 then it
is doing it's endless loop.
Regards
Stefan Reiser
_______________________________________________________
Reply to this item at:
<http://savannah.gnu.org/bugs/?36211>
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Nachricht gesendet von/durch Savannah
http://savannah.gnu.org/
- [Octave-bug-tracker] [bug #36211] bug: crashes and endless loops, anonymous, 2012/04/16
- [Octave-bug-tracker] [bug #36211] bug: crashes and endless loops, Philip Nienhuis, 2012/04/16
- [Octave-bug-tracker] [bug #36211] bug: crashes and endless loops,
anonymous <=
- [Octave-bug-tracker] [bug #36211] bug: crashes and endless loops, John W. Eaton, 2012/04/17
- [Octave-bug-tracker] [bug #36211] bug: crashes and endless loops, anonymous, 2012/04/18
- [Octave-bug-tracker] [bug #36211] bug: crashes and endless loops, John W. Eaton, 2012/04/18
- [Octave-bug-tracker] [bug #36211] bug: crashes and endless loops, anonymous, 2012/04/19
- [Octave-bug-tracker] [bug #36211] bug: crashes and endless loops, Philip Nienhuis, 2012/04/19