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Re: help with gaussfit [message #35344] Mon, 09 June 2003 07:16
Craig Markwardt is currently offline  Craig Markwardt
Messages: 1869
Registered: November 1996
Senior Member
Tapuosi Lotoaniu <lotoaniu@atmos.ucla.edu> writes:


> Hi,
>
> given,
>
> yfit = gaussfit(x,y,A)
>
> I know that A(0) = height, and A(1) = centre of gaussian. How is the width
> A(2) defined? How do I get FWHM from the value?

A(2) is the 1-sigma width, as in exp(-(x-xmean)^2/(2*sigma^2)).

You should derive the conversion from sigma to full width half maximum
yourself, (just set the gaussian to 1/2 and solve for x in terms of
sigma), but it's close to 2.35.

Craig

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