# [Ifeffit] number of independent points

George Sterbinsky GeorgeSterbinsky at u.northwestern.edu
Mon Oct 10 09:39:00 CDT 2011

Sorry, the log file is from Artemis, not Athena...

On Mon, Oct 10, 2011 at 10:35 AM, George Sterbinsky <
GeorgeSterbinsky at u.northwestern.edu> wrote:

> Hello,
>
> Since I haven't received a response to my previous question, I just wanted
> to make sure I asked it clearly. To elaborate, I am attaching a log from
> Athena. The log file lists:
>
>  "Independent points          =      27.057617188"
>
> If I attempt to reproduce this result using the equation in the feffit
> document, I find
>
> Nidp = { [2*(kmax - kmin)*(Rmax-Rmin) / pi] + 2} = { [2*(14 - 0.5)*(4.2 -
> 1.0) / pi] + 2} = 29.50197417,
>
> where I have used the k-range and R-range in the log file as kmax, kmin,
> Rmax, and Rmin.
>
> Can someone explain to me why may calculation does not reproduce the number
> given for "independent points" in the log fie?
>
> Thank you,
> George
>
> On Fri, Oct 7, 2011 at 1:04 PM, George Sterbinsky <
> GeorgeSterbinsky at u.northwestern.edu> wrote:
>
>> Hello,
>>
>> I am wondering what values Artemis/feffit use for kmax and kmin when
>> calculating the number of independent points (Nidp) for a fit done in
>> R-space, where according the feffit document, Nidp = { [2*(kmax -
>> kmin)*(Rmax-Rmin) / pi] + 2}, and kmax and kmin define the fitting range. I
>> have tried using the Fourier transform range for kmax and kmin, but this
>> does not give agreement with the value of Nidp reported by Artermis.
>>
>> Thank you,
>> George
>>
>
>
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