Hello Mateusz,

Thank you very much for your reply to my inquiry. Before I try the PyMOL 
extension you mentioned, I want to try scripting language in pymol. I wrote a 
attemptive one (align.py):

cmd.load("A.gro")
cmd.load("A.xtc")
cmd.load("ref.pdb")
for i in range(1, 5001):
   cmd.align(ref, A,target_state=i)

I ran it in pymol command line, but it doesn't work. I am new to pymol 
scripting. Could you write a correct one for me? Thank you very much.

Best regards,

Yeping 



------------------------------------------------------------------
From:Mateusz Bieniek <bieniek...@gmail.com>
Sent At:2019 Aug. 19 (Mon.) 20:32
To:孙业平 <sunyep...@aliyun.com>
Cc:pymol-users <pymol-users@lists.sourceforge.net>
Subject:Re: [PyMOL] How to calculate rmsd between each state of a MD simulation 
trajectory and a reference structure?

Hi Sunyeping,

Besides using the scripting language in pymol, you might want to consider the 
experimental PyMOL extension created by the PyMOL Fellows (me and Paul Smith, 
https://pymol.org/fellowship/). The extension relies on the MDAnalysis package 
and so far includes RMSD as an example. Here is the link to the right github 
branch https://github.com/bieniekmateusz/pymol-open-source/tree/fellows_mp_2018

If you compile it, you can use the RMSD this way: 
mda_load systemX.gro
mda_load_traj systemX.xtc
mda_rmsd 


Kind Regards, 
Mateusz

On Mon, 19 Aug 2019 at 12:53, sunyeping via PyMOL-users 
<pymol-users@lists.sourceforge.net> wrote:
Dear everyall,

I loaded a molecular dynamics simulation trajectory (A.xtc) of 5000 frames and 
a reference structure (B.pdb) into pymol. I wish to get the rmsd value between 
each state of the MD simulation trajectory and the reference structure, but I 
don't know how. I can use the align command as: "align A, B", but this only 
gives one rmsd value. Could you tell me how to get the rmsd value between each 
state of the MD simulation trajectory and the reference 
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