Constraints to parameters in FindFit?
- To: mathgroup at smc.vnet.net
- Subject: [mg51200] Constraints to parameters in FindFit?
- From: Jill Foley <efoley at princeton.edu>
- Date: Fri, 8 Oct 2004 02:54:48 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
I am using FindFit to fit a series of peaks to some data. I would like
to be able to constrain some of the parameters of my fit to correspond
to physical reality. For example, some peaks should have a negative
amplitude, others positive, where the amplitudes are the parameters
that Mathematica is finding in FindFit. The peaks are all very near
each other, so without any constraint, it is making the wrong ones
negative. I'd like to specify that a given parameter should always be
negative. I am already giving an initial guess of the proper sign, but
it doesn't fix the problem.
Please advise - Thanks!
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