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 NLSF user-defined function help needed!		  New Topic  Reply to Topic
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findme

China
Posts
Posted - 08/20/2005 :  12:16:22 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Sorry for this dummy question. But I am really a newbie of Origin.
I have a dataset and want to use NLSF to fit the data. I already know the equation we should apply. But I don't know how to define the function in Origin7 which I am using now even after I read through the help files. Hope someone can help me with this function below.
The function is:
y=abs(a*tan(b*x)) [abs represents the absolute value]

I want to fit the dataset and get the best-fit a&b values.Thanks in advance!


Findme

Mike Buess

USA
3037 Posts
Posted - 08/21/2005 :  10:24:55 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi FindMe,

Have you looked at the Nonlinear Curve Fitting tutorial? The procedure for creating a fitting function is explained fairly well there.

Mike Buess
Origin WebRing Member
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