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 Limiting Non-Linear Fit Function		  New Topic  Reply to Topic
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esacay

Canada
1 Posts
Posted - 10/29/2013 :  8:48:01 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin 9.0.0. B45
Windows 7

I am trying to fit a collection of data points using the NLFit dialog. The overall function that I need to use is a sum of 3 separate functions [F(x) = A(x)+B(x)+C(x)]. How do I specify that one of my separate functions is only included to a certain point? ie.

B(x) = N*exp[(x-x0)/B)], for x<x0
B(x) = 0, for x>= x0


ES

Hideo Fujii

USA
1582 Posts
Posted - 10/30/2013 :  09:51:40 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi esacay,

You can use the conditional operator which has the following syntax:
<CONDITION>?<VALUE_ON_TRUE>:<VALUE_ON_FALSE>
http://wiki.originlab.com/~originla/ltwiki/index.php?title=LabTalk:Operators#Conditional_Operator_.28.3F:.29

So, in your case:
B(x)=x<x0?N*exp((x-x0)/B0)):0;
Note: I have changed the parameter B to B0 as it conflicts with the function name.

--Hideo Fujii
OriginLab
Edited by - Hideo Fujii on 10/30/2013 09:54:34 AM
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