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[Octave-bug-tracker] [bug #49871] ode15s, MStateDependence option incorr
From: |
Bill Greene |
Subject: |
[Octave-bug-tracker] [bug #49871] ode15s, MStateDependence option incorrect |
Date: |
Sat, 17 Dec 2016 18:58:18 +0000 (UTC) |
User-agent: |
Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36 |
URL:
<http://savannah.gnu.org/bugs/?49871>
Summary: ode15s, MStateDependence option incorrect
Project: GNU Octave
Submitted by: billgreene
Submitted on: Sat 17 Dec 2016 06:58:17 PM GMT
Category: Octave Function
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: dev
Operating System: Any
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Details:
I have just started doing some testing of the new ode15s function.
I have discovered incorrect behavior when the Jacobian option is
specified. I get the following warning message:
warning: with MStateDependence != 'none' an internal approximation of Jacobian
Matrix will be used. Set MStateDependence equal to 'none' if you want to
provide a constant or time-dependent Jacobian
warning: called from
ode15s at line 258 column 7
test_ode15s_jac at line 23 column 13
I believe that ode15s.m is, for some reason, using the setting of
MStateDependence to ignore my Jacobian function. This is the
wrong interpretation of MStateDependence. My understanding is
that MStateDependence in MATLAB just serves as a "hint" to the code that it
may be able to adjust the algorithm slightly to improve performance.
I am attaching a small script that reproduces this behavior.
_______________________________________________________
File Attachments:
-------------------------------------------------------
Date: Sat 17 Dec 2016 06:58:17 PM GMT Name: test_ode15s_jac.m Size: 1kB
By: billgreene
<http://savannah.gnu.org/bugs/download.php?file_id=39260>
_______________________________________________________
Reply to this item at:
<http://savannah.gnu.org/bugs/?49871>
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