I tried select WITHIN(distance,planeType, planeDesignation) with slab and 
polymer. This doesn't make difference between negative and positive numbers in 
slab and polymer once defined the plane. 

Thanks, Piero 
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Pieremanuele Canepa
Room 104
Functional Material Group
School of Physical Sciences, Ingram Building,
University of Kent, Canterbury, Kent,
CT2 7NH
United Kingdom

e-mail: [email protected]
mobile: +44 (0) 7772-9756456
-----------------------------------------------------------
________________________________________
From: Robert Hanson [[email protected]]
Sent: Monday, October 25, 2010 12:02 PM
To: [email protected]
Subject: Re: [Jmol-users] Several questions

On Sun, Oct 24, 2010 at 7:05 PM, P.Canepa 
<[email protected]<mailto:[email protected]>> wrote:

Dear all,

I got several questions to ask

1) I was wondering whether is possible or not to re-set the origin of the 
unitcell. The command set unitcell {1/2 1/2 1/2 } do that. Apparently is just a 
graphical nice feature.In fact,  I noticed that whenever I operate an expansion 
of the cell with the command load '' { 2 1 1 } the cell origin is always  set 
to 0 0 0. How come ?  Is it possible to fix the origin of the cell. This 
becomes particularly useful when user want to change periodical properties of 
crystals.

Because the symmetry operators are based on the unit cell having a specific 
origin. Obviously if you have P1 symmetry it doesn't matter, but that's a 
special case. Changing the unit cell using the UNITCELL command is not just for 
looks. It changes the calculation of atom properties uxyz, ux, uy, and uz.


2) I also noticed a possible bug when I use PACKED on 2D slab periodic 
structure, the structure becomes flat loosing all the Z coordinates. I didn't 
try the case od polymer but I suspect is the same.


ok, I'll get that fixed.

3) Is in Jmol any way to select many atoms in one shot ! It would be nice 
having a sort of 2D, 3D graphic selectors. The possibility of drawing line, 
circle and sphere into Jmol to select many atoms contemporaneously would be 
rather useful.  This is especially true when the user want for instance remove 
atoms located in the same area  or refine a structure before creating a 
snapshot. Secondly the numerical selection available in Jmol is only useful 
when atom are grouped forming sequence. This is not always the case.


all this is possible. Check the documentation.

4) Bob the Z-matrix functions you kindly sent me doesn't work for crystals and 
surfaces. To be precise it works but
loosing entirely the structure periodicity.Have a try

Are you saying you want to add an atom in every unit cell using internal 
coordinates? Then I think that's up to you to write a specialized set of 
functions that does that. It should be possible. Just increment the final atom 
position by whatever unit cell coordinates you have, and it should work.



Thanks a lot, Piero
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Please consider the environment before printing this e-mail.

Pieremanuele Canepa
Room 104
Functional Material Group
School of Physical Sciences, Ingram Building,
University of Kent, Canterbury, Kent,
CT2 7NH
United Kingdom

e-mail: [email protected]<mailto:[email protected]>
mobile: +44 (0) 7772-9756456
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Robert M. Hanson
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St. Olaf College
1520 St. Olaf Ave.
Northfield, MN 55057
http://www.stolaf.edu/people/hansonr
phone: 507-786-3107


If nature does not answer first what we want,
it is better to take what answer we get.

-- Josiah Willard Gibbs, Lecture XXX, Monday, February 5, 1900

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Create new apps & games for the Nokia N8 for consumers in  U.S. and Canada
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