[Ifeffit] Trouble with fitting with Arthemis

[Bruce Ravel]

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
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