Tom,

The complication with cmd.align() is that it is doing a whole lot more than a 
simple alignment.  The first number is in fact the RMS, but it covers only the 
subset of the input atoms remaining after refinement is completed. The count of 
aligned atoms is the second field.

If you're looking for exact RMS fit values over a well-defined set of atoms, 
try using cmd.pair_fit(sele1, sele2) instead, for example:

load $TUT/1hpv.pdb

create loopA, A/46-55/

create loopB, B/46-55/

show sticks, loop*

print cmd.pair_fit("loopA////CA", "loopB////CA")

Cheers,
Warren

-----Original Message-----
From: Thomas Evangelidis [mailto:te8...@mbg.duth.gr]
Sent: Wed 10/28/2009 8:09 PM
To: pymol-users@lists.sourceforge.net
Subject: [PyMOL] how to get RMSD from align command
 
Simple question, it must have been answered before but couldn't find  
it so far:

how can I get the RMSD value from the align command in a python  
script? cmd.align() returnes a tuple of 8 numbers and none of them is  
the actual RMSD value I get when I align these 2 structures manually.

thanks,Tom


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