Michael,
I'm also playing with the nls function trying to get it to work
with a Gaussian. My lines that I have at the moment and I hope will help you
are
class(fo <- (x ~ (A/(sig*sqrt(2*pi)))* exp(-1*((bin-mu)^2/(2* sig^2)
nls.AB <- nls(fo,data=freq.tab, start=
Whoops, I forgot to add, many thanks to all who replied publicly and
privately. I am very appreciative of all comments and suggestions.
Mark Leeds was especially kind in terms of clarifying why my
description of the situation was so confusing.
Cheers,
Michael
On Aug 26, 2006, at 2:51 PM, Mi
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
7;t take my word in stone. someone else
will likely reply.
- Original Message -
From: "Michael Koppelman" <[EMAIL PROTECTED]>
To:
Sent: Friday, August 25, 2006 3:35 PM
Subject: Re: [R] fitting a gaussian to some x,y data
> Thank you. Yes, I do feel that I am under-qualifie
Thank you. Yes, I do feel that I am under-qualified to even ask
questions of y'all. Plus I'm an astronomer, which doesn't help! ;)
I'll try again.
I have two columns of data, the first column (x) is a distance (or
length or separation) and the second column (y) is a flux (or number
of cou
Michael Koppelman wrote:
> I apologize if this is redundant. I've been Googling, searching the
> archive and reading the help all morning and I am not getting closer
> to my goal.
>
> I have a series of data( xi, yi). It is not evenly sampled and it is
> messy (meaning that there is a lot of scat
I apologize if this is redundant. I've been Googling, searching the
archive and reading the help all morning and I am not getting closer
to my goal.
I have a series of data( xi, yi). It is not evenly sampled and it is
messy (meaning that there is a lot of scatter in the data). I want to
fi
