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Re: Fitting Experimental Data

• To: mathgroup at smc.vnet.net
• Subject: [mg116531] Re: Fitting Experimental Data
• From: mathilde Favier <fmath at hotmail.fr>
• Date: Fri, 18 Feb 2011 04:36:29 -0500 (EST)

Hi Everybody,

Thank you very much for your help but it seems like I've found the solution.
The Fit I am looking for is working. I made a really bad mistake.
I removed the points of the Top of my curve, and tried to find a fit like a Gaussian with the remained points.
Actually it worked, I just didn't gave enought points to replot the curve with its top.

Nonetheless I have a lot to do now and all your advices were really helpfull.

thank you everybody

Have a nice weekend

Mathilde

FAVIER MathildeTel: + 33 (0)6 35 29 36 96fmath at hotmail.fr




> Date: Wed, 16 Feb 2011 10:17:29 -0600
> From: danl at wolfram.com
> To: fmath at hotmail.fr
> Subject: Re: [mg116433] Fitting Experimental Data
>
> mathilde Favier wrote:
> > Hi Daniel,
> >
> > First thank you for you answer:
> > I am not sure you well understood my trouble.
> >
> > I am only fitting the Y values as ''dataleftlowband''. The X values are
> > points spaced by one.
> >
> > To reexplain my trouble, I am trying to Fit a curve which looks like an
> > asymetric Gaussian only with the rising and falling edge because I had
> > to remove the top of my plot which was full of picks.
> > I want to reconstitute the top of my curve.
> > I am manually removing the picks using a threshold.
> >
> >
> > PS: I have 2 asymetric Gaussian given by my Data, the Goal is to Find a
> > fit for them separatly.
> >
> > Are those explanation more clear?
> >
> > I am enclosing the problem with all the plots in a PDF file that way you
> > will more see what I am talking about.
> >
> > Thank you
> >
> > Mathilde*
> > *
>
> Okay, I see what you have now. Some people already gave what appear to
> be reasonable suggestions. One is to leave the top parts in and let Fit
> work on the full data set. A second one it to smooth the top parts and
> Fit to the revised data. Most people think the first is a better idea.
>
> Daniel
>