The Math Forum

Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Math Forum » Discussions » Software » comp.soft-sys.matlab

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: Start Curve Fitting Tool GUI with initial guesses and bounds already entered
Replies: 3   Last Post: Jun 26, 2012 11:47 AM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]

Posts: 115
Registered: 12/27/07
Re: Start Curve Fitting Tool GUI with initial guesses and bounds already entered
Posted: Jun 25, 2012 4:24 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

"Eli" wrote in message <jsaalj$cb2$>...
> I'm still interested in getting help for this. I have tried but can't get this to work.
> If you could offer some help or re-direct me to another sub-forum/newsgroup that would be really helpful.


It might be easier if, instead of the GUI, you used programmatic curve-fitting such as 'lsqnonlin', 'lsqcurvefit' or one of the others that allow parameter bounds. (Unless I overlooked something in the documentation, '' and 'nlinfit' don't allow parameter bounds.)

The problem I (and perhaps others) have in responding to your question is that you stated:

Is there some way that I can specify the custom fitting equation, initial guesses, lower and upper bounds from the command line similar to how I specified the exclusion range?'

and then:

'NOTE: I do not want to perform command line curve fitting.'

So I'm not sure what you actually want to do. Programmatic curve-fitting (from a script, not the command line) is easy enough and will do what you want, even if it's not quite as straightforward as using the GUI. I've only done programatic curve-fitting and haven't had any problems with it.

Your use of 'Inf' and '-Inf' in your bounds also makes me a bit queasy. Why not '1E+100' and '-1E+100' or some such instead? It would achieve the same essential effect and wouldn't produce an unbounded or undefined result if your objective function wandered off into the wilderness.

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© The Math Forum at NCTM 1994-2018. All Rights Reserved.