Hi Peter,

On Fri, 03 Apr 2009 02:38:03 +0530, peter hudson
<peter.hudson.pe...@gmail.com> wrote:

> Hello all
> 
> I am trying to upload the ED map on pymol. but, it is not visible on the
> screen. Although i checked at pymol wiki and i did as it is given on the
> wiki.
> For example.
> 
> I took ccp4 format map and coverted it into xplor format with
> mapman.(beacuse i tried with ccp4 format map with test_file.map as well as
> test_file.ccp4 maps, but pymol showed this kind of error. I begin like this-

Warren answered the later problem regarding the "site" selection or object.
You should be able to load a ccp4 map either directly as a .ccp4 file, or to
force it to load as a ccp4 format with:

load test_file.ccp4, map, format=ccp4

Does PyMOL complain that it doesn't know the format with an error like:

  PyMOL>load test_ccp4.map
  Error: .map is ambiguous.  Please add format or use another extension:
  Error: For example, "load fofc.map, format=ccp4" or "load 2fofc.xplor".

or was the error that you couldn't display the map on the molecule (as in the
error that Warren commented on about using "site" as a selection when site
has not been defined?

Also be aware that PyMOL needs to have a map that is calculated to cover the
molecule that you are showing since it does not automatically extend the map
using symmetry.

Cheers,
Rob

-- 
Robert L. Campbell, Ph.D.
Senior Research Associate/Adjunct Assistant Professor 
Botterell Hall Rm 644
Department of Biochemistry, Queen's University, 
Kingston, ON K7L 3N6  Canada
Tel: 613-533-6821            Fax: 613-533-2497
<robert.campb...@queensu.ca>    http://pldserver1.biochem.queensu.ca/~rlc

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