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 Non-linear Fit Asymptotic		  New Topic  Reply to Topic
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bradwurst

Germany
1 Posts
Posted - 08/01/2014 :  06:42:11 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. and Service Release (Select Help-->About Origin): 9.1 0G b275
Operating System: Windows 7

Hallo community,

I want to perform two independent nonlinear asymptotic fits with:

(1) y(x) = A(x->infinity) + B*x^(-3)
(2) y(x) = A(x->infinity) + B*exp(-x+1) + C*exp(-x+1)^2

I've tried to implement those fits to origin, but it doesn't work, because I have huge problems to write the correct Origin C code. Can you help me?

Thanks,
Jan

lkb0221

China
497 Posts
Posted - 08/04/2014 :  10:17:50 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

What does your A(x->INFINITY) mean?
Anyway, you can build a user-define fitting function with 2 dependent variables (y1 & y2) so that they will be fitted simultaneously.
http://www.originlab.com/doc/Tutorials/UserDef-FitFunc
http://www.originlab.com/doc/Origin-Help/UserDef-FitFunc

Zheng
OriginLab
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