[Chimera-users] how2 select named selections using command-line [chimera1.5.3]

Eric Pettersen pett at cgl.ucsf.edu
Tue Jan 31 13:55:21 PST 2012

Hi Fred,
	I've committed a change to both the daily build and the 1.6 release  
candidate that will cause the "sel" command to treat your old  
selectors as wanting to do atom selection rather than model activation  
(namely, if the argument to the "sel" commands contains any characters  
that are illegal in the model-activation mode [anything but dash,  
comma, period or digits] then it will try to do atom selection).

On Jan 31, 2012, at 1:34 PM, frederick lee wrote:

> hi elaine,
> thanks for the quick help. i tried using aliases just now.
> now i have 4 aliases: g0a, g0b, g1a, g1b.
> i can only sel all 4 groups by using
>> sel g0a | g0b | g1a | g1b
> the & operator returns nothing as there are
> no intersection among the 4 groups.

Right.  You said "and" in your original mail and in English that can  
be ambiguous whether that corresponds to "and" or "or" in boolean  
logic.  As you figured out, you actually wanted the boolean or ("|").

> seemed the & is intersection and not plus here.
> when i used
>> sel g0a,g0b,g1a,g1b
> i got error.
> given above, seemed like i need to do something like
>> sel (g0a | g0b | g1a | g1b) & without CA/C1'
> but parentheses are not legal here. how should i get
> around this? thanks again.

For a complication selection like this it's probably easiest to do it  
in two steps:

sel g0a | g0b | g1a | g1b ; sel sel & without CA/C1'


                         Eric Pettersen
                         UCSF Computer Graphics Lab

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