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Curvefit on PV-Wave [message #20314]

Thu, 01 June 2000 00:00

rkj
Messages: 66
Registered: February 1996

Member

Does anyone have a *PV-Wave* routine that will perform a non-linear
least squares fit? Apparently I am not the only one unhappy with
the standard CURVEFIT function; I have seen a number of IDL routines
that would probably give the desired results.

Maybe I should port these to PV-Wave? This appears to be somewhat
involved however.

Kyle J.

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Re: Curvefit on PV-Wave [message #20317 is a reply to message #20314]

Thu, 01 June 2000 00:00

davidf
Messages: 2866
Registered: September 1996

Senior Member

R. Kyle Justice (rkj@dukebar.crml.uab.edu) writes:

> Does anyone have a *PV-Wave* routine that will perform a non-linear
> least squares fit? Apparently I am not the only one unhappy with
> the standard CURVEFIT function; I have seen a number of IDL routines
> that would probably give the desired results.
>
> Maybe I should port these to PV-Wave? This appears to be somewhat
> involved however.

This is a totally uninformed opinion, of course, but
I should have thought the porting would be a slam-dunk.

Cheers,

David

P.S. Let's just say I doubt if the +, -, *, and / operators
have changed much from when IDL and PV-Wave were the same thing. :-)

--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155

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Re: Curvefit on PV-Wave [message #20364 is a reply to message #20314]

Wed, 07 June 2000 00:00

Karl Young
Messages: 31
Registered: April 1996

Member

Gee, when are we going to have IMSL style options in IDL... :-(

> : "R. Kyle Justice" wrote:
> : >
> : > Does anyone have a *PV-Wave* routine that will perform a non-linear
> : > least squares fit? Apparently I am not the only one unhappy with
> : > the standard CURVEFIT function
>
> : Do have the IMSL Math/Stats option for PV-WAVE? If so,
> : then a good option for non-linear fitting is the
> : NLINSQ function, which solves a nonlinear least-squares
> : problem using a modified Levenberg-Marquardt algorithm.
>
> : Hope this helps,
> : M. Williams
> : Resource Engineering, Inc.
>
> My Math toolkit has been lying around dormat for some time so I forgot
> to look there. Thanks! It works perfectly.
>
> Kyle

--
Karl Young
UCSF,VA Medical Center
MRS Unit (114M)
4150 Clement Street
San Francisco, CA 94121

Email: kyoung@itsa.ucsf.edu
Phone: (415) 750-2158 lab
(415) 750-9463 home
FAX: (415) 668-2864

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