Ben,
As noted, PyMOL can already read XTCs via the VMD plugins. However, your
question is a good one: How can one update coordinates directly from
Python?
Unfortunately, there isn't an optimal way to do this yet, but here is one
way:
# example .py file for PyMOL
from pymol import cmd, stored
# force PyMOL to keep the input atom ordering
cmd.set("retain_order")
# load a PDB file
cmd.load("$TUT/1hpv.pdb","mov")
# create a new state 2 (copy of state 1)
cmd.create("mov","mov",1,2)
# get the coordinates from state 2 into a Python list
stored.list = []
cmd.iterate_state(2,"mov","stored.list.append([x,y,z])")
# create a modified list of coordinates
new_list = []
for xyz in stored.list: \
new_list.append([xyz[0]*0.7,xyz[1]*0.7, xyz[2]*0.7])
stored.list = new_list
# update the state 2 coordinates inside PyMOL
stored.list.reverse()
cmd.alter_state(2,"mov","(x,y,z)=stored.list.pop()")
# and rebuild the graphics objects
cmd.rebuild("mov")
Cheers,
Warren
--
DeLano Scientific LLC
Subscriber Support Services
mailto:del...@delsci.info
> -----Original Message-----
> From: pymol-users-boun...@lists.sourceforge.net
> [mailto:pymol-users-boun...@lists.sourceforge.net] On Behalf
> Of Benjamin Hall
> Sent: Thursday, May 01, 2008 3:07 AM
> To: pymol-users@lists.sourceforge.net
> Subject: [PyMOL] Adding new states from data
>
> Hi
>
> I've written an XTC (gromacs trajectory) reader in python,
> and I'm interested in using it to load xtc files in pymol.
> The file itself doesn't contain any atom/residue name
> information, just a list of coordinates compressed using a
> novel compression algorithm. How could I manually add a state
> to a model, replicate the metadata from the first state, then
> add the coordinate information from a frame? I couldn't see
> how to do this from the wiki
>
> Many thanks in advance
>
> Ben
>
>
> **************************************************************
> **********
> Benjamin A. Hall
> Structural Bioinformatics & Computational Biochemistry Unit
> University of Oxford http://sbcb.bioch.ox.ac.uk/hall.php
> +44 (0)1865 275380
> benjamin.h...@bioch.ox.ac.uk
>
>
>
>
>
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