Re: [R] fitting a gaussian to some x,y data

From: Michael Koppelman <michael_at_isis.spa.umn.edu>
Date: Sun 27 Aug 2006 - 05:51:54 EST

Success! The line I needed was:

gcoeffs <-nls(y~(a/b)*exp(-(x-c)^2/(2*b^2)),start=list (a=0.4,b=2,c=-10), trace=TRUE)

I also needed to provide good guesses for a, b and c. The attached PNG should explain what I was going after, which is the line in the center of that curve. I am sorry for my confusing and perhaps incorrect usage of terminology.

Cheers,
Michael



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example3.png
Received on Sun Aug 27 05:56:36 2006

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