New Platon Addsym web tutorial for finding missing symmetry

Lachlan Cranswick l.cranswick at dl.ac.uk
Sun Jan 7 03:51:13 EST 2001


For those who don't normally check for updates often on the 
crystallographic software they use, following is an example
why this may be a good thing to do, especially with Ton Spek's
Platon:

"Why you should keep updating your version of Platon and another 
ADDSYM example of why Platon/Addsym should be considered a 
mandatory program for all crystallographers"

  http://www.ccp14.ac.uk/tutorial/platon/addsymc.htm

The recent versions of Platon have been updated with respect to
the Addsym algorithm now handling 1/2,1/3,1/4,1/8, etc, subcells.

The above tutorial uses an example starting structure in P1 with 
"96" independent Carbon atoms.

 The pre November 20th, 2000 version of Platon's Addsym would find
 a P-1 half cell  ("24" independent Carbon atoms) 

 However, the newest Addsym within Platon will now find the best
  cell as being P 21/C -  1/8 subcell: ("3" independent Carbon atoms) 

Structure files are also included in Shelx format for those
who would like to try this out.  Using Addsym within Platon is
highly trivial, i) Load file, ii) click Addsym button, iii) be
happy.

-------

Also refer:

PLATON/ADDSYM analysis of all 1970 Cc structures in the CSD (apr 1999): 
        http://www.cryst.chem.uu.nl/platon/cc.mis 
        http://www.ccp14.ac.uk/ccp/web-mirrors/platon-spek/platon/cc.mis
        CCP14 Canadian Mirror 

PLATON/ADDSYM analysis of all 1848 P1 structures in the CSD (Oct 1999):
        http://www.cryst.chem.uu.nl/platon/p1.mis 
        http://www.ccp14.ac.uk/ccp/web-mirrors/platon-spek/platon/p1.mis
        http://ccp14.sims.nrc.ca/ccp/web-mirrors/platon-spek/platon/p1.mis

------

For UNIX users:

UNIX Script for semi-automatic download and Compilation of Platon
   http://www.ccp14.ac.uk/tutorial/platon/auto_compile_script.html

==================================================

Platon - (with Pluton/Addsym/Sqeeze/System S) for UNIX by Ton Spek:
  http://www.cryst.chem.uu.nl/platon/
  http://www.ccp14.ac.uk/ccp/web-mirrors/platon-spek/platon/
  http://ccp14.sims.nrc.ca/ccp/web-mirrors/platon-spek/platon/
  
Platon Download:
  ftp://xraysoft.chem.uu.nl/pub/
  http://www.ccp14.ac.uk/ccp/ccp14/ftp-mirror/platon-spek/pub/ 
  ftp://ftp.ccp14.dl.ac.uk/ccp14/ftp-mirror/platon-spek/pub/
  http://ccp14.sims.nrc.ca/ccp/ccp14/ftp-mirror/platon-spek/pub/

====================

Hints on compiling/installing platon for UNIX/Linux/FreeBSD:

  http://www.ccp14.ac.uk/tutorial/platon/installunix.html

====================

Platon for Windows (ported by Louis Farrugia:)
  http://www.chem.gla.ac.uk/~louis/software/
  http://www.ccp14.ac.uk/ccp/web-mirrors/farrugia/~louis/software/
  http://ccp14.sims.nrc.ca/ccp/web-mirrors/farrugia/~louis/software/

==================================================

For UK users of the EPSRC funded CHEMICAL DATABASE SERVICE 
giving free access to UK students and academics to all the main
structure databases - MDF, ICSD, Cambridge (as well as other 
relevant databases related to chemistry)

  http://cds3.dl.ac.uk/cds/cds.html

Platon is installed on cds3.dl.ac.uk - and is invoked by typing:

   platon  filename.ins  (or res, cif, pdb or spf)

(primarily for using Platon as a user friendly front end for 
"quest" to do Cell and Connectivity searches on the Cambridge 
database)

For Windows users needing freeware X-servers, refer:

Secure MS-Windows to UNIX machines based X-Sessions via 
Secure Shell Tunnelling:
(Using Teraterm for Windows and MI/XServer v 5.6 as an example)
 http://www.ccp14.ac.uk/ccp14admin/security/secure_x_session_tunnelling.htm

Lachlan.

----------------------
Lachlan M. D. Cranswick

Collaborative Computational Project No 14 (CCP14)
    for Single Crystal and Powder Diffraction
Daresbury Laboratory, Warrington, WA4 4AD U.K
Tel: +44-1925-603703  Fax: +44-1925-603124
E-mail: l.cranswick at dl.ac.uk  Ext: 3703  Room C14
                           http://www.ccp14.ac.uk

After 10th January 2001 - visiting:
   CSIRO Division of Minerals, Bayview Ave, Clayton, 
       Melbourne, Victoria, Australia, 3168







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