[Ifeffit] Trouble with fitting with Arthemis

[Kleper Oliveira Rocha]

Hi Bruce,

I send to you the project.

2009/1/13 Bruce Ravel <bravel at bnl.gov>

>
> Hi Kleper,
>
> But your reduced chi-square is only 10^35.  That seems like a pretty good
> fit... ;-)
>
> There is obviously a numerical problem, corrupted data, corrupted project
> file -- something like that.
>
> Can you send me the project file?
>
> B
>
> > Please, help me. When I try to do any fit in Arthemis, setting all
> > parameters unless one, been this one any of the parameters, the fit gives
> > for the answer -1.0000 +/- 0.000000 like example down. What is happening?
> >
> > ============================================================
> > Independent points          =       8.239257812
> > Number of variables         =       1.000000000
> > Chi-square                  =   0.120000000E+37
> > Reduced Chi-square          =   0.165762849E+36
> > R-factor                    =               NaN
> > Measurement uncertainty (k) =       0.000437667
> > Measurement uncertainty (R) =       0.000724906
> > Number of data sets         =       1.000000000
> >
> > Guess parameters +/- uncertainties  (initial guess):
> > *  amp             =    -1.0000000   +/-      0.0000000    (1.0000)*
> > Set parameters:
> >   enot            =  0
> >   delr            =  0
> >   ss              =  0.003
> >   c3              =  0.0001
> >   c4              =  0.00001
>
>
>
> --
>
>  Bruce Ravel  ------------------------------------ bravel at bnl.gov
>
>  National Institute of Standards and Technology
>  Synchrotron Methods Group at NSLS --- Beamlines U7A, X24A, X23A2
>  Building 535A
>  Upton NY, 11973
>
>  My homepage:    http://xafs.org/BruceRavel
>  EXAFS software: http://cars9.uchicago.edu/~ravel/software/exafs/
>  _______________________________________________
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>



-- 
Kleper de Oliveira Rocha
Doutorando em Engenharia Química
Departamento de Engenharia Química/UFSCar
Tels. 55 016 3351-8694
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