[phenixbb] test set count question

Nathaniel Echols nechols at lbl.gov
Wed Aug 8 11:26:20 PDT 2012

On Wed, Aug 8, 2012 at 11:19 AM, Pavel Afonine <pafonine at lbl.gov> wrote:
>  <Fobs> or "F/SigF and DF/SigDF" are derived from Fobs(+) and Fobs(-) with
> some information lost. That is you cannot restore the original Fobs(+) and
> Fobs(-) from <Fobs> or from "F/SigF and DF/SigDF". phenix.refine restores
> Fobs(+) and Fobs(-) from "F/SigF and DF/SigDF" for internal use making an
> arbitrary decision about the sign. phenix.refine cannot handle "F/SigF and
> DF/SigDF" and has no reason to do this.

Does XDS (or xdsconv) not include the ISYM column?  In some files, we
get a combination of columns like this:


which is the same thing, but the ISYM column indicates how the DANO is
applied to the Friedel mates, meaning that we can reconstruct the
original F+ and F-.  There's nothing wrong with using these data in
Phenix - without ISYM, however, the DANO is useless.


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