From walt /at\panix.com Fri Oct 18 17:11:12 1996 Received: from panix3.panix.com for walt "-at-" panix.com by www.ccl.net (8.8.0/950822.1) id RAA07221; Fri, 18 Oct 1996 17:05:22 -0400 (EDT) Received: from localhost (walt "-at-" localhost) by panix3.panix.com (8.7.6/8.7/PanixU1.3) with SMTP id RAA27165; Fri, 18 Oct 1996 17:05:13 -0400 (EDT) Date: Fri, 18 Oct 1996 17:05:12 -0400 (EDT) From: Walter Polkosnik To: lawson- at -argus.cem.msu.edu cc: CHEMISTRY _-at-_)www.ccl.net Subject: Re: CCL:curve fit? In-Reply-To: <199610181912.PAA01445 |-at-| mulliken.cem.msu.edu> Message-ID: Errors-To: walt.,at,.panix.com MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII On Fri, 18 Oct 1996 lawson #at# argus.cem.msu.edu wrote: > > Hello, > I am looking for a program (fortran or C) that will fit > a function (Morse like or n-order polynomial) to data (potential > curve). Does anyone know of any free programs available. I > checked the net and could not readily locate anything. I will > summarize results. > > Thanks > Dan Lawson > lawson-!at!-argus.cem.msu.edu > Graduate Student > Michigan State University The best routines I've found at lmdif and nl2sol, both from netlib (netlib.att.com). They are very robust nonlinear curve fitting routines. I have looked through quite a lot that is available on the net, and I have been very impressed with performance of both these routines. You will have to write the driving program, since they are Fortran subroutines. I believe lmdif is part of the 'matfit' package in netlib and nl2sol is part of the TOMS collection of software. -- Walter Polkosnik walt #at# panix.com Physics Department http://www.physics.qc.edu/~walt Queens College, City University of New York (718)-997-3364 voice Credo quia absurdum est. (718)-997-3349 fax