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 NLSF Fitting issue		  New Topic  Reply to Topic
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Onailime

Italy
Posts
Posted - 02/17/2005 :  05:47:12 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Version (Select Help-->About Origin): 7.0
Operating System: windows 98 se

Hi,

I have a large number of curves that I would like to automate the fitting of with Origin C. I am trying to use the NLSF in Origin C to do this using the following code borrowed from an example somewhere:
NLSFCntrl nlsfMyFit;// create NLSFcntrl - see OC_Types.h for details
initNLSF(nlsfMyFit); // initialize structure with default initial values
nlsfMyFit.imaxIter=1000;
nlsfMyFit.pasteToPlot = true;
nlsfMyFit.pasteToResults = true;
lstrcpy(nlsfMyFit.szYdataName, strYDataName); // assign fit dataset name
lstrcpy(nlsfMyFit.szFuncName, "lorentz"); // assign fitting function name
fitNLSF(nlsfMyFit);

The problem is that when I ask for the Results (i.e. the first parameter using nlsfMyFit.Par[1])
it returns the initialization parameters whereas the results.
Can someone help me?

Mike Buess

USA
3037 Posts
Posted - 02/17/2005 :  09:01:32 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
I'm afraid you've stumbled across an obsolete Origin C method. The following comment is in the header of OC_Types.h in 7.0SR4...

//LAS, 1/31/03 commented out NLSFCntrl; using NLSF = LabTalk.NLSF can be used instead

Before you can use LabTalk.NLSF you must download/apply the SR4 patch...

http://www.originlab.com/index.aspx?s=9&lm=76


Then download the MultiFit add-on in the File Exchange...

http://www.originlab.com/fileexchange/details.aspx?fid=56

Even if it doesn't do exactly what you need at least you'll find some examples for using LabTalk.NLSF in MultiFit.c.

Mike Buess
Origin WebRing Member
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Gary Lane

USA
150 Posts
Posted - 02/17/2005 :  09:15:03 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Ciao!

I think NLSFCntrl is an older method that was developed before LabTalk object access was greatly improved in Origin C. Perhaps you might prefer the following in Origin C.

// After this line you should be able to directly use the LabTalk
// NLSF object in Origin C
using NLSF = LabTalk.NLSF;
NLSF.maxIter = 1000;
// etc.

Hope this helps.

Gary
OriginLab

P.S. As Mike said I would first get the latest patch.

Edited by - Gary Lane on 02/17/2005 09:16:44 AM
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