Hi Vijay,
All "by"-operators have a weak priority, so you'll need an extra set of
parenthesis there:
carb_pos = cmd.select('e. C and (byring e. C) and (pc.>0)')
See also the yellow highlighted note about "Entity expansion" here:
https://pymolwiki.org/index.php/Selection_Algebra
Cheers,
Thomas
> On Feb 1, 2018, at 4:16 AM, Vijay Masand wrote:
>
> Dear PyMOL users,
> Today, I used following command to select positively charged ring
> carbon atoms, surprisingly, PyMOL 2.0.7 selected negatively charged
> ring carbon atoms also. Is it a bug or issue associated with 'Byring'?
> carb_pos = cmd.select('e. C and Byring e. C and (pc.>0)')
> I am sharing the image for better understanding.
> Cheers
> Vijay
--
Thomas Holder
PyMOL Principal Developer
Schrödinger, Inc.
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