Hi Chuck & Jason,

escaping the hyphen also works for me:

color red, resi \-50

Cheers,
   Thomas

Jason Vertrees wrote, On 04/05/12 14:37:
> Hi Chuck,
> 
> PyMOL assumes your residues identifiers will be non-negative. Bad
> assumption. PyMOL parses the string "-50" as the range "0-50". This
> should be filed as a bug on the open-source tracker.
> 
> In the meantime, you will have to adjust all the identifiers in order
> to select. If -73 is the lowest number in the sequence in chain J then
> you can add 73 to add indices like this,
> 
> # adjust the indices
> 
> alter chain J, resi=str(int(resi)+73)
> 
> # update the sequence
> 
> sort
> 
> Now, just add 73 when you select:
> 
> select c. J and i. 0
> 
> Cheers,
> 
> -- Jason
> 
> On Thu, Apr 5, 2012 at 7:57 AM, chuck <chlang...@ucdavis.edu> wrote:
>> In the 147bp nucleosome structure pdb1kx5 the DNA is a palindrome and 
>> numbering of the resi(dues) starts a the center bp (74), so -73 to +73.  The 
>> central bp is numbered 0.
>>
>> Can someone tell me the command syntax to set the colors of the bps before 
>> the central bp, e.g.,
>>
>> -50.
>>
>> commands such as "color red, (resi -50)"  changes all the bp unto +50 (124).
>>
>> Cheers,
>> Chuck

-- 
Thomas Holder
MPI for Developmental Biology
Spemannstr. 35
D-72076 Tübingen

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