[phenixbb] question on f/sigf

[Boaz Shaanan]

Hi,

I think that the math you're looking for is on p. 329 of Rupp's book BMC (eqs. 7-47 - 7-50).

         Cheers,

                   Boaz


Boaz Shaanan, Ph.D.
Dept. of Life Sciences
Ben-Gurion University of the Negev
Beer-Sheva 84105
Israel

E-mail: bshaanan at bgu.ac.il
Phone: 972-8-647-2220  Skype: boaz.shaanan
Fax:   972-8-647-2992 or 972-8-646-1710





________________________________________
From: phenixbb-bounces at phenix-online.org [phenixbb-bounces at phenix-online.org] on behalf of fn1 at rice.edu [fn1 at rice.edu]
Sent: Saturday, July 14, 2012 1:52 AM
To: PHENIX user mailing list
Subject: Re: [phenixbb] question on f/sigf

thank you!

Quoting Nathaniel Echols <nechols at lbl.gov>:

> On Fri, Jul 13, 2012 at 2:25 PM, <fn1 at rice.edu> wrote:
>
>> I am wondering why f/sigf is always about twice of i/sigi. Is there any
>> mathematics behind this relation? Maybe it is not directly related to
>> phenix, but i sincerely hope someone could help me with it.
>>
>
> I don't know the logic behind this, but from notes in our code, the default
> implementation appears to be this one:
>
> http://www.iucr.org/__data/iucr/cif/software/xtal/xtal372htmlman/html/addref-desc.html
>
>
> specifically, section 4.5.2.4.
>
> -Nat
>



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