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Conditional Curve Fitting with multiple Gaussian Components using MPFIT [message #75973]

Wed, 11 May 2011 06:41

Jeffrey Chan
Messages: 3
Registered: May 2011

Junior Member

Hi, everyone, I just did a search on internet and couldn't find a
suitable solution on my problem, so I send an email to Dr. Fanning,
and he told me to ask here.

I am currently using IDL for doing some data analysis, including
curve fitting with Gaussian functions.

I tried to use the MPFIT package to construct a model three-Gaussian-
component curve (say Gaussian A + Gaussian B + Gaussian C ) and give
suitable estimates for the fitting program.
The problem is that, there are some constrains/conditions within
these 3 Gaussians, i.e. there are not really independent to each
other. For example, the sigma of Gaussian A must be greater than
Gaussian B, but these two sigmas are not related to each other by an
equation so i cannot parametrize them.

Is there any way so I can specify conditions like that in the
fitting routine?

Thanks

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[Message index]

		Conditional Curve Fitting with multiple Gaussian Components using MPFIT By: Jeffrey Chan on Wed, 11 May 2011 06:41
		Re: Conditional Curve Fitting with multiple Gaussian Components using MPFIT By: Craig Markwardt on Thu, 12 May 2011 20:50

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