comp.lang.idl-pvwave archive: archive

Home » Public Forums » archive » LSODE implemantation

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

LSODE implemantation [message #35981]

Tue, 05 August 2003 05:18

Theo Brauers
Messages: 58
Registered: November 1997

Member

Hi.

A long time ago there was a discussion about the quality of the
implementation of LSODE in IDL. I intend to use LSODE
in the near future and I'm interested in any report about the
bugs and the goodies in that routine. Alternatvely I could
use LSODE (fortran) or CVODE (C) as an external routine.
Are there ready to use dll s or dlm s and the respective
ILD pro files?

Thanks Theo

----------------------------
Theo Brauers
ICG-II (Troposph�re)
Forschungszentrum J�lich
52428 J�LICH, Germany
Tel: +49-2461-616646
Fax: +49-2461-615346

Report message to a moderator

Re: LSODE implemantation [message #36025 is a reply to message #35981]

Sun, 10 August 2003 09:54

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

"Theo Brauers" <th.brauers@NOSPAM.fz-juelich.de.NOSPAM> writes:

> Hi.
>
> A long time ago there was a discussion about the quality of the
> implementation of LSODE in IDL. I intend to use LSODE
> in the near future and I'm interested in any report about the
> bugs and the goodies in that routine. Alternatvely I could
> use LSODE (fortran) or CVODE (C) as an external routine.
> Are there ready to use dll s or dlm s and the respective
> ILD pro files?

Sorry for responding so late to this question. It "scrolled" too far.

I have an ODE solver on my web page named DDEABM. It is a variable
order Adams Bashford Moulton solver (predictor corrector) with error
control. I've used it quite a bit for several problems; and I
recently had a report of someone using it to successfully solve 65,000
simultaneous equations! DDEABM (and Runge Kutta for that matter) is
really only appropriate for non-"stiff" sets of equations.

Good luck,
Craig

http://cow.physics.wisc.edu/~craigm/idl/idl.html (under math)

--
------------------------------------------------------------ --------------
Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
------------------------------------------------------------ --------------

Report message to a moderator

Re: LSODE implemantation [message #36163 is a reply to message #36025]

Wed, 20 August 2003 04:15

Theo Brauers
Messages: 58
Registered: November 1997

Member

Craig Markwardt wrote:
> "Theo Brauers" <th.brauers@NOSPAM.fz-juelich.de.NOSPAM> writes:
>
>
>
>> Hi.
>>
>> A long time ago there was a discussion about the quality of the
>> implementation of LSODE in IDL. I intend to use LSODE
>> in the near future and I'm interested in any report about the
>> bugs and the goodies in that routine. Alternatvely I could
>> use LSODE (fortran) or CVODE (C) as an external routine.
>> Are there ready to use dll s or dlm s and the respective
>> ILD pro files?
>
>
> Sorry for responding so late to this question. It "scrolled" too far.
>
> I have an ODE solver on my web page named DDEABM. It is a variable
> order Adams Bashford Moulton solver (predictor corrector) with error
> control. I've used it quite a bit for several problems; and I
> recently had a report of someone using it to successfully solve 65,000
> simultaneous equations! DDEABM (and Runge Kutta for that matter) is
> really only appropriate for non-"stiff" sets of equations.
>
> Good luck,
> Craig
>
> http://cow.physics.wisc.edu/~craigm/idl/idl.html (under math)
>

Thanks for your answer. However, I am searching for a solver for
a stiff set of ODEs in the order of 10000 simultaneous equations.
So far I am using facsimile (a commercial product from AEA) as an
external solver but I would like to integrate the solver into my IDL
routines espcially when IDL 6 allows to give away programs to people
who do not intend to pay the RSI and AEA licence fees.

Best Theo

Report message to a moderator

Previous Topic:	IDL function randperm?
Next Topic:	trouble with writing to HDF-file

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Wed Oct 08 19:21:01 PDT 2025

Total time taken to generate the page: 0.00550 seconds