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 Is there a problem with my fitting function?
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franhofer

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Posted - 08/03/2010 :  05:02:05 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
y = A1*exp((x-y*F)/v)+ A2*exp((x-y*F)/(2*v))+(x-y*F)/R

I have been trying to fit this function using the nonlinear curve fitting.
v is fixed. Indpt variable is x and dependent variable is y.

The variable parameters are F, A1, A2 and R. However, my value of F does not iterate at all and it always churns out the same value whenever I complete the FitNL. The other values of A1, A2 and R are good though. Is there a problem with the way I write the function.

My function form of Y-script or equation works.

larry_lan

China
Posts

Posted - 08/03/2010 :  09:26:33 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi:

What's your Origin version? How about sending us some data to try? And please also tell us what's the initial values and your Origin serial number in your email. I don't see any different to simulate an Origin C and Y-Script function with the same function form. You can also send us the FDF files if you like.

Thanks
Larry
OriginLab Technical Services
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franhofer

5 Posts

Posted - 08/04/2010 :  04:35:25 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
I just solved this problem! Thanks. It was due to some wrong setting.
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