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 user defined fitting function builder
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kngozibullock@usbr.gov

USA
1 Posts

Posted - 02/26/2016 :  3:14:30 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
I am attempting to fit my data using the following:
y=(((0.667)*M*Poe*((OCR/2.0)^A)*ln(Ir))/(1+50*x))+((Poe*(1-(OCR/2.0)^A))/(1+5000*x))

I have defined all my variables. When I evaluate the equation I get realistic values of y, but the function will not converge. I have tried using various function types, but am not familiar with Origin C or Lab TALK script. Not sure if this is an error in my function or function type or other user error.

KNB

Shirley_GZ

China
Posts

Posted - 02/29/2016 :  02:51:29 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi KNB,

Please send us the function file (.FDF file) and the project via tech@originlab.com.

The initial values of those parameters are also appreciated.

Thanks,
Shirley

Originlab Technical Service Team
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