Re: [phenixbb] A couple of questions regarding twinning

Hi Owen, R = |Fobs - Wcalc|/Fobs Wcalc = sqrt( alpha Fcalc1^2 + Fcalc2^2(1-alpha) ) Sorry Pietro, only a single domain is possible at this moment. Map coefficients are such that effects of twinning are not present 2010/6/3 Owen Pornillos :

On a related note, how is the R factor calculated with twinned structures (i.e., how is Fcalc determined for the purposes of R factor calculation)? Thanks, Owen

On Jun 3, 2010, at 10:27 AM, Nathaniel Echols wrote:

On Thu, Jun 3, 2010 at 6:52 AM, Pietro Roversi wrote:

...

(see attached file) but only the last one seems to be used. Do I guess correctly that there is only provision for two domains adn therefore the last twinning definition overrides any previously defined one?

Correct.

...

If so, is there a way of specifying and using multiple twinning domains/operators?

Currently phenix.refine is limited to a single twin operator. -Nat

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