in the most recent version of PyMOL, which can render measurement objects with 
shaders, you can also use the distance command to get a similar result:

set use_shaders
set dash_gap, 0
distance sele and n. CA, sele and n. CA

Cheers,
  Thomas

On Feb 21, 2013, at 10:11 PM, Tsjerk Wassenaar <tsje...@gmail.com> wrote:
> Hi,
> 
> If you want to draw all bonds for all pairs between two selections,
> you can just use bond:
> 
> bond sele and n. ca, sele and n. ca
> 
> 
> Hope it helps,
> 
> Tsjerk
> 
> On Thu, Feb 21, 2013 at 9:19 PM, Robert Campbell
> <robert.campb...@queensu.ca> wrote:
>> Hi Anasuya,
>> 
>> On Thu, 21 Feb 2013 17:10:40 +0530
>> Anasuya Dighe <anas...@mbu.iisc.ernet.in> wrote:
>> 
>>> 
>>> Hi,
>>> 
>>> I have been trying to use the script draw_links.py at
>>> http://pldserver1.biochem.queensu.ca/~rlc/work/pymol/ to view links
>>> between each pair of c-alpha atoms present in an atom selection.
>>> Once I load a PDB (1q16.pdb) and make an atom selection, lets say :
>>> PyMOL>select pk1, name CA in resi 5+10+15+12+16 and chain C , on the
>>> PyMOL>command-line in pymol, I
>>> do : PyMOL>run draw_links.py
>>> 
>>> I wanted to visualise links between all pairs of calpha atoms present in
>>> the atom selection, pk1.
>>> However I am unable to do that using draw_links.py
>>> I am doing: PyMOL> draw_links pk1
>>> 
>>> How can I do this using draw_links.py?
>>> Where am I going wrong?
>> 
>> Perhaps the instructions are not clear enough, but the script is not
>> designed to automatically draw links between all pairs of C-alphas in a
>> selection. It expects two different selections and it will draw links
>> between the first residue of each selection and then the second and so on.
>> It doesn't therefore make sense to give it the same selection for both
>> because, in your example, it draws a zero-length link between residue 5 and
>> residue 5, and another between residue 10 and residue 10 and so on.
>> 
>> You will have to run the script multiple times to get the links you want:
>> 
>> draw_links name CA & resi 5 and chain C, name CA  resi 10 and chain C
>> draw_links name CA & resi 5 and chain C, name CA  resi 15 and chain C
>> draw_links name CA & resi 5 and chain C, name CA  resi 12 and chain C
>> 
>> Sorry that it doesn't quite do what you were expecting!  I designed it for
>> the situation where I have two structures that exhibit a conformational
>> change and I wanted to show how the C-alphas were moving so then it made
>> sense to have the two selections be the same atoms, but in different
>> molecules.
>> 
>> Cheers,
>> Rob

-- 
Thomas Holder
PyMOL Developer
Schrödinger Contractor


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