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 NLSF in Origin C and assigning parameters		  New Topic  Reply to Topic
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oconnor

UK
Posts
Posted - 02/21/2005 :  10:00:03 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Version (Select Help-->About Origin):
Operating System: WinXP

Hi,

I am fitting a number of curves in Origin C with the following:

using NLSF = LabTalk.NLSF;
NLSF.Init();
NLSF.PasteToPlot = 1;
NLSF.Func$ = "boltzmann";
NLSF.FitData$ = strYDataName1;
NLSF.Execute("parainit");
NLSF.Fit(100);

I keep receiving error messages to the effect of "try setting parameter A2 as fixed" etc. How do I go about setting some parameters as fixed, while letting others vary with the NLSF.Execute("parainit") statement?

Thanks for your help.

Rod.

Mike Buess

USA
3037 Posts
Posted - 02/21/2005 :  10:19:33 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Rod,

NLSF.v1 = 1; // vary first parameter
NLSF.v2 = 0; // fix second parameter
- etc. -

Mike Buess
Origin WebRing Member
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easwar

USA
1965 Posts
Posted - 02/21/2005 :  10:25:28 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Rod,

Since this is a LabTalk object, you need to look under the LabTalk language reference help file to find all associated methods and properties of the NLSF object. You can look up the section: LabTalk Language Reference -> Object Reference -> Alphabetical Listing of Objects -> NLSF

Also, if you keep getting messages that ask you to fix one parameter or another, it is possible that the function and data are not a good match and no convergence is being acheived. Try fitting the data manually with the NLSF tool with the chosen function first.

Easwar
OriginLab



Edited by - easwar on 02/21/2005 10:27:07 AM
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