I failed to notice that you are trying to input a range of residues '17-19'

Make sure to input single atom selections to get correct distances and not an average:
A straightforward way to get that name is to click on the atom while in the 'editing mode' of pymol: pymol will print: "you clicked" followed by a name that can be copy-pasted.
e.g.  "You clicked /lys///LYS`2/CA -> (pk1)" can be used to copy-paste /lys///LYS`2/CA

Another alternative is to use selections to identify one atom:
e.g.
cmd.distance('chain B and resi 297 and name CB','chain A and resi 17 and name CB')

from pymol import cmd

# open dist.txt for writing
f=open('distnew.txt','w')

# calculate the distance and store it in dst
dst1=cmd.distance('chain B and resi 297 and name CB','chain A and resi 17 and name CB')
dst2=cmd.distance('chain B and resi 297 and name CB','chain A and resi 18 and name CB')
dst3=cmd.distance('chain B and resi 297 and name CB','chain A and resi 19 and name CB')

# and then for writing the output file
f.write("%8.3f\n"%dst1)
f.write("%8.3f\n"%dst2)
f.write("%8.3f\n"%dst3)

f.close()

Cheers,

Andreas

On Tue, Jun 17, 2014 at 8:45 PM, Andreas Warnecke wrote:
Hej Suzanne,

you will need to append the other two distances to the script to get them printed.
Following your example that would be something like:

# calculate the distance and store it in dst
dst1=cmd.distance('tmp','B///297/cb','A///17-19/cb')
dst2=cmd.distance('tmp','B///297/cb','A///17-19/cb') # change the selections in this line!
dst3=cmd.distance('tmp','B///297/cb','A///17-19/cb') # change the selections in this line!

# and then for writing the output file
f.write("%8.3f\n"%dst1)
f.write("%8.3f\n"%dst2)
f.write("%8.3f\n"%dst3)

inserting these blocks in your script hopefully will do the trick.

Cheers,

Andreas

On Tue, Jun 17, 2014 at 8:21 PM, Lapolla, Suzanne M (HSC) wrote:
Another follow up question to this. I decided to use the measure distance python script on the pymol wiki to do this, and I was able to do it successfully with a range of residues, but my question is about the output txt file.  When I run the script I get the correct distances (all 3 of them) to show on the GUI but the text file that is generated (distnew.txt) only lists one distance--so perhaps the script needs to be modified for this as well for the residues measured?

The original script is at the link http://www.pymolwiki.org/index.php/Measure_Distance
and my modified version is below. Suggestions appreciated! Thank you.

# This script writes the distance from
# atom mol1///25/ha to atom mol1///26/ha
# out to the file "dist.txt"
# Simply change your selections to see different distances.

# import PyMOL's command namespace
from pymol import cmd

# open dist.txt for writing
f=open('distnew.txt','w')

# calculate the distance and store it in dst
dst=cmd.distance('tmp','B///297/cb','A///17-19/cb')

# write the formatted value of the distance (dst)
# to the output file
f.write("%8.3f\n"%dst)

# close the output file.
f.close()
________________________________________
From: Robert Campbell [robert.campbell@queensu.ca]
Sent: Monday, June 09, 2014 10:04 AM
To: pymol-users@lists.sourceforge.net
Subject: Re: [PyMOL] command question RE printing out distances to text file

Hi Suzanne,

You can also get the distance printed in the external GUI or terminal window
by using the "cmd.distance" version of the command.  So either you can
assign the distance to a variable and print it or you can print the result
directly.

Assuming you have two selections, sele1 and sele2 specifying the atoms of
interest you can do:

d = cmd.distance(sele1,sele2)
print sele1,sele2,d

Cheers,
Rob

On Mon, 2014-06-09
13:13 EDT, Thomas Holder <thomas.holder@schrodinger.com> wrote:

> Hi Suzanne,
>
> you can use the get_distance command. It doesn't generate a distance
> object but prints the distance to the external window.
>
> https://urldefense.proofpoint.com/v1/url?u=http://pymolwiki.org/index.php/Get_Distance&k=7DHVT22D9IhC0F3WohFMBA%3D%3D%0A&r=1ciN0EuZ9XNq3lPnYtgkI5sKPXgKVaywidBN0C981SQ%3D%0A&m=fr2bAoLQoVgp9h2t2fgBvfGVVX7oQ1g14g1AODFz%2FRg%3D%0A&s=921f4dfed39cd38f4ae7a70dfb937844d4e3faf1bc967c2f4d1f2944fa2ea31b
>
> Cheers,
>   Thomas
>
> On 06 Jun 2014, at 23:03, Lapolla, Suzanne M (HSC)
> <suzanne-lapolla@ouhsc.edu> wrote:
>
> > Fellow Pymol Users:
> > I may have asked this question before...but if so have forgotten. I am
> > measuring distances between 2 atoms in 2 different objects using the
> > distance command, and it is working perfectly, but I wonder if there is
> > a command I can use/add so that those distances can be printed in the
> > external gui as well as being shown in the viewer. I will be doing lots
> > of these at the same time and the screen will get crowded. Thank you in
>

--
Robert L. Campbell, Ph.D.
Dept. of Biomedical & Molecular Sciences
Botterell Hall Rm 644
Queen's University,
Tel: 613-533-6821

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