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Groups > comp.lang.python > #20271
| From | Robert Kern <robert.kern@gmail.com> |
|---|---|
| Subject | Re: Numeric root-finding in Python |
| Date | 2012-02-12 13:52 +0000 |
| References | <4f375f0f$0$29986$c3e8da3$5496439d@news.astraweb.com> |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.5725.1329054788.27778.python-list@python.org> (permalink) |
On 2/12/12 6:41 AM, Steven D'Aprano wrote: > This is only peripherally a Python problem, but in case anyone has any > good ideas I'm going to ask it. > > I have a routine to calculate an approximation of Lambert's W function, > and then apply a root-finding technique to improve the approximation. > This mostly works well, but sometimes the root-finder gets stuck in a > cycle. I don't have any advice for fixing your code, per se, but I would just grab mpmath and use their lambertw function: http://mpmath.googlecode.com/svn/trunk/doc/build/functions/powers.html#lambert-w-function -- Robert Kern "I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth." -- Umberto Eco
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Numeric root-finding in Python Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-02-12 06:41 +0000
Re: Numeric root-finding in Python Eelco <hoogendoorn.eelco@gmail.com> - 2012-02-12 02:10 -0800
Re: Numeric root-finding in Python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-02-12 13:39 +0000
Re: Numeric root-finding in Python Terry Reedy <tjreedy@udel.edu> - 2012-02-12 16:19 -0500
Re: Numeric root-finding in Python 88888 Dihedral <dihedral88888@googlemail.com> - 2012-02-12 05:13 -0800
Re: Numeric root-finding in Python Robert Kern <robert.kern@gmail.com> - 2012-02-12 13:52 +0000
Re: Numeric root-finding in Python Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-02-12 22:53 +0000
Re: Numeric root-finding in Python inq1ltd <inq1ltd@inqvista.com> - 2012-02-12 10:20 -0500
Re: Numeric root-finding in Python David Monaghan <monaghand.david@gmail.com> - 2012-02-21 01:33 +0000
Re: Numeric root-finding in Python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-02-21 02:21 +0000
Re: Numeric root-finding in Python Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-02-12 11:47 -0500
Re: Numeric root-finding in Python Dave Angel <d@davea.name> - 2012-02-12 12:00 -0500
Re: Numeric root-finding in Python Mark Dickinson <mdickinson@enthought.com> - 2012-02-12 12:18 -0800
Re: Numeric root-finding in Python Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-02-12 23:05 +0000
Re: Numeric root-finding in Python Dave Angel <d@davea.name> - 2012-02-12 18:52 -0500
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