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Finding initial parameter for nl fitting
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[quote][i]Originally posted by irismidas[/i] [br]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 [b]y=0.037685+0.034905*sin((4*pi)/(532*10^-9)*C*(-A*(exp(-x/A)-1)+B*(exp(-x/B)-1))+3.8605); [/b] 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 [img]http://www.originlab.com/ftp/forum_and_kbase/Images/Raw_data.png[/img] Could anyone help me or tip me on getting the initial guess values for the parameters? [/quote]
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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?
1 L A T E S T R E P L I E S (Newest First)
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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