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 Initialization of parameters in user defined funct		  New Topic  Reply to Topic
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bpbag

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Posted - 12/02/2010 :  08:22:44 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hi,
I am unable to fit the non-linear curve with a user defined function. It is not initializing at all? Do I require any initialization of parameters? and How?
The function is
y=(a*(h+x+1/k)-sqrt((a^2)*(h+x+1/k)^2-4*h*x*a^2))/2
where X is the independent variable, Y is the dependent variable and a,h,k are the parameters.

Shirley_GZ

China
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Posted - 12/02/2010 :  10:04:00 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi bpbag,

Yes, you need to initialize your parameters when you do fitting with a user-defined function. But if you create a new function in Fitting Function Builder in Origin 8.5, Origin will set the initial values of all parameters as "1" by defualt.

More details, please refer to parameter initialization.

Shirley

Originlab Technical Service Team
Edited by - Shirley_GZ on 12/02/2010 10:04:15 PM
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