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 Finding initial parameter for nl fitting

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T O P I C    R E V I E W
irismidas Posted - 04/07/2014 : 7:01:55 PM
Origin Ver. and Service Release (Select Help-->About Origin):
Operating System: Origin Pro 9.1

Hello everyone.

I am having trouble finding the initial parameter for user defined non-linear fitting.

For the fitting equation I am using is

y=0.037685+0.034905*sin((4*pi)/(532*10^-9)*C*(-A*(exp(-x/A)-1)+B*(exp(-x/B)-1))+3.8605);


It is basically an exponential in a sin function where A,B, and C are the parameters.

Here is what my raw data looks like



Could anyone help me or tip me on getting the initial guess values for the parameters?
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greg Posted - 04/11/2014 : 09:17:06 AM
A reply is here:
http://www.originlab.com/forum/topic.asp?TOPIC_ID=19426

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