Re: Lorentzian on a baseline
- To: mathgroup at smc.vnet.net
- Subject: [mg89189] Re: [mg89178] Lorentzian on a baseline
- From: Sseziwa Mukasa <mukasa at jeol.com>
- Date: Thu, 29 May 2008 07:01:27 -0400 (EDT)
- References: <200805280845.EAA27166@smc.vnet.net>
On May 28, 2008, at 4:45 AM, fred.engles at gmail.com wrote:
> I'm trying to fit a Lorentzian subtracted from a constant baseline,
> using findfit.
>
> FindFit[rawdata, m1 - m2/((x - m3)^2 + m2^2), {m1, m2, {m3, 250}}, x,
> MaxIterations -> 10000]
>
> Isn't working - either a totally flat horizantal line, or the
> subtracted 'Lorentzian' looks almost delta-function sharp. Help?
Your Lorentzian has no amplitude parameter, are you sure it's of
amplitude 1/m2?
Supplying rawdata would help too, perhaps it's too noisy?
Regards,
Ssezi
- References:
- Lorentzian on a baseline
- From: fred.engles@gmail.com
- Lorentzian on a baseline