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hassan2020

Morocco
6 Posts
Posted - 01/31/2009 :  11:54:11 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hi
I'm a biginner in origin.
can you please to show me how to fit this function in originC
y=sum(P1*exp(x)/k +P2*x**2) with k=1,1000
thanks

Deanna

China
Posts
Posted - 02/01/2009 :  04:12:31 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Hassan,

We are very happy to help you. But, please tell us what do you mean by "sum()"? In "P2*x**2", the "**" just means "*", right?

Deanna
OriginLab Technical Services
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hassan2020

Morocco
6 Posts
Posted - 02/01/2009 :  06:15:54 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi
y=sum(P1*exp(x)/k +P2*x^2) with k=1,1000
means
y=(P1*exp(x)/1 +P2*x^2)+(P1*exp(x)/2 +P2*x^2)+(P1*exp(x)/3+P2*x^2)+..

thanks
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Deanna

China
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Posted - 02/02/2009 :  01:55:01 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
With a little bit transformation, your equation can be rewritten as (please correct me if I am wrong):


This is actually a simple equation. There are two parameters, P1 and P2. The equation written in Origin C can be:
y=1000*P2*x^2+7.4854708605503*P1*exp(x)

Here is an example of defining a fitting funciton with Origin C:
User Defined Fitting Function using Origin C

If you are still not sure how to define your function, please contact us again.


Deanna
OriginLab Technical Services
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