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hassan2020

Morocco
6 Posts
Posted - 02/04/2009 :  05:34:57 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hi
please
how to fit this function in origiC
y=[exp(P1*x/1) +P2*x^1]+[P1*exp(x/2) +P2*x^2]+[P1*exp(x/3)+P2*x^3]+[P1*exp(x/4)+P2*x^]+[P1*exp(x/5)+P2*x^5]+...+[P1*exp(x/k)+P2*x^k]+......
(k=1,...,1000)

thanks for help.

VincentLiu

China
Posts
Posted - 02/05/2009 :  04:49:26 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply

Hi hassan2020,

You may use following codes to define the function:

y=P1*exp(x)+P2*x;
for (int ii=2;ii<=1000;ii++)
{
y= y+P1*exp(x/ii)+P2*x^ii;
}

The following image may help you to define the fitting function. Please note that I treat your function as

y= [P1*exp(x/1) +P2*x^1] +[P1*exp(x/2) +P2*x^2]+[P1*exp(x/3)+P2*x^3]+...+[P1*exp(x/k)+P2*x^k]+......
(k=1,...,1000)

There is a minor different between your function and the function above. So if you wrote the function correctly, you need to do minor modification to the codes.



For more details about User-Defined function, please refer to

http://www.originlab.com/www/helponline/Origin8/en/mergedProjects/Tutorial/Tutorial/User_Defined_Fitting_Function_using_OC.html

Best regards,
Vincent Liu
OriginLab Technical Services
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