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Re: TNMIN limits [message #57119 is a reply to message #57118]

Mon, 03 December 2007 05:08

Brian Larsen
Messages: 270
Registered: June 2006

Senior Member

While admittedly I have not used TNMIN before, it is often good
practice to use several different methods of function minimization on
the given problem. There are issues associated with each solver, what
it requires ad what it can handle. For instance there is a class of
solvers that require derivatives and a class that don't. If your
function has regions that are not differential then that method will
have issues... there is a list in idl of built-in minimization
routines (there are 5-6). Everyone has their own favorite but I often
use ameoba() first, it doesn't need derivatives and seems to work well
and fast. The function that you are minimizing has to be written to
enforce limits on variables but thats not too bad to do,

a few web resources:
ameoba (a c code base but lots of good information)
http://solar.physics.montana.edu/kankel/ph567/examples/minim ization/
conjugate-gradient:
http://solar.physics.montana.edu/kankel/ph567/resources/conj ugate_gradient/

Cheers,

Brian

------------------------------------------------------------ --------------
Brian Larsen
Boston University
Center for Space Physics

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[Message index]

		Re: TNMIN limits By: Brian Larsen on Tue, 04 December 2007 06:56
		Re: TNMIN limits By: jameskuyper on Tue, 04 December 2007 05:22
		Re: TNMIN limits By: biophys on Mon, 03 December 2007 23:27
		Re: TNMIN limits By: Brian Larsen on Mon, 03 December 2007 06:36
		Re: TNMIN limits By: d.poreh on Mon, 03 December 2007 05:43
		Re: TNMIN limits By: Brian Larsen on Mon, 03 December 2007 05:12
		Re: TNMIN limits By: Brian Larsen on Mon, 03 December 2007 05:08
		Re: TNMIN limits By: d.poreh on Tue, 04 December 2007 09:15

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