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- Newsgroups: sci.math.num-analysis
- Path: sparky!uunet!usc!howland.reston.ans.net!news.ans.net!cmcl2!panix!banana
- From: banana@panix.com (Walter Polkosnik)
- Subject: Re: non-linear least-squares fitting
- Message-ID: <C173FK.5DI@panix.com>
- Organization: PANIX Public Access Unix, NYC
- References: <1jkb5nINN8qn@iskut.ucs.ubc.ca>
- Date: Thu, 21 Jan 1993 08:26:07 GMT
- Lines: 25
-
- In <1jkb5nINN8qn@iskut.ucs.ubc.ca> holland@geop.ubc.ca (Stephen Holland) writes:
-
-
- >Does anyone out there know where I might find a good public domain routine
- >for doing non-linear least-squares fitting WITHOUT derivative information.
- >I'm looking for something along the lines of POWELL in Numerical Recipes or
- >CHIFIT in Bevington. ForTran source would be nice since my software is
- >writen in ForTran but i can translate from C if need be.
-
- >thanks
-
- >steve holland
-
- I have used subroutine LMDIF from MINPACK (which you can get from netlib) and
- NL2SOL (which you can also get from netlib, as part of TOMS) extensively and
- for all my applications they work great. You can always do some kind of
- difference approximation to the derivatives if you don't want to calculate them
- explicitly (which is what those two subroutines do).
-
- Those two routines are also very simple to program around also.
-
- --
- Walter Polkosnik
- Physics Department banana@panix.com
- Queens College, CUNY {cmcl2,apple}!panix!banana
-