[EMAIL PROTECTED] wrote:


The posre itp file represents one lipid molecule and the p2.itp file represents all water molecules. I have a p1.itp file that represents one water molecule but this also brought up the :

cpp exit code: 256
cpp: too many input files
[tripos]dopc/minidopc$ Tried to execute: '/lib/cpp -I -I/usr/local/share/gromacs/top -DPOSRES dopc.top > grompptByAm1'

You have to be very carefull in the order that you include the information into the
topology files.
Basically you should include the information of posre after tohe topology with the
"ifdef" flag ...

AND the position restrain on water must not include all water molecules !
You define it for one molecule.

XAvier

--
----------------------------------
Xavier Periole - Ph.D.

Dept. of Biophysical Chemistry / MD Group Univ. of Groningen
Nijenborgh 4
9747 AG Groningen
The Netherlands

Tel: +31-503634329
Fax: +31-503634398
email: [EMAIL PROTECTED]
web-page: http://md.chem.rug.nl/~periole
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