Dear Robert,
Thank You very much, now the tip is moving. 
Just I would like to ask you another question related to that please, after I 
did the movement of the tip as you taught me, I wrote in the console (write 
output.xyz) the file is saved but when I open it again in Jmol, the Si (Silicon 
substrate) disappear. Jmol just showing me the tip only without the silicon 
substrate.  My question is 

How to save the whole structure in (xyz format)? which means I need to save a 
file including the Silicon substrate and tip after the new coordinates and the 
movement of the tip?   

Many thanks,RajabDate: Wed, 4 Jun 2014 21:13:23 -0500
From: [email protected]
To: [email protected]
Subject: Re: [Jmol-users] FW: (Set picking dragmolecule) problem

 I think you are just running into memory issues. You can reduce those by:

set autobond false
set preservestate false
set allowMoveAtoms true

then use 


select _C
set dragselected

and use alt-shift-left-drag. 

I did this, and the carbon tip moved quite smoothly.

Bob





On Wed, Jun 4, 2014 at 4:54 PM, Eng.Rajab Al-Sayegh <[email protected]> 
wrote:




Dear Jmol users and developers,
As for the attached file that could be found here 
https://www.dropbox.com/s/z5v4zd2kcyx047l/output.xyz

there are two types of atoms: Carbon tip (represented as a ball) and Silicon 
substrate.
What I just want to do to the structure, is to move the whole ball (the set of 
Carbon atoms) at once, without causing the substrate to move.

I have done it plenty of times before for smaller structure, simply by choosing 
the function (drag molecule) or by typing (set picking dragmolecule) in the 
console and move the simple structure.

for some unknown reason, the function (set picking dragmolecule) does not work 
with the attached structure when I'm trying to move the Carbon atoms (the whole 
ball) at once.

I don't really know whither this problem is due to the file contents (large 
structure) or Jmol limitation.
Please assist me with how to tackle this issue to move that ball.

Regards,Rajab                                                                   
          

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