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oconnor

UK
Posts
Posted - 01/18/2005 :  11:05:02 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Version (Select Help-->About Origin): 7.5
Operating System: XP

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:

using NLSF = LabTalk.NLSF;
NLSF.Init();
NLSF.PasteToPlot = 1;
NLSF.Func$ = "boltzmann";
NLSF.FitData$ = strYDataName;
NLSF.xBegin = 60;
NLSF.xEnd = 120;
NLSF.Execute("parainit");
NLSF.Fit(100);

The problem is that I am not getting the same results as when I pick part of a curve (between 60 and 120 for example) manually with the Data Selector tool and then use 'Fit Sigmoidal' from the 'Analysis' menu. What I would like to know is how to perform the same fitting operation as the 'Fit Sigmoidal' function to get the results I can get manually in an automated way.

Thanks,

Rod.

Mike Buess

USA
3037 Posts
Posted - 01/18/2005 :  12:16:46 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Rod,

For designating the fitting range use NLSF.dataBegin/dataEnd instead of NLSF.xBegin/xEnd.

Mike Buess
Origin WebRing Member
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