On 1/3/13 2:01 PM, James Starlight wrote:
Justin,

thanks again for explanation. By the way if I define in topology top
LJ params like

; Include forcefield parameters
#include "gromos53a5.ff/forcefield.itp"

[ atomtypes ]
;name  at.num   mass      charge ptype       c6           c12
   CH2    6     0.000      0.000     A  0.0074684164  3.3965584e-05
   CH3    6     0.000      0.000     A  0.0096138025  2.6646244e-05

[ nonbond_params ]
; i    j func          c6           c12
  CH3      CH2  1  0.008473481  3.0084136e-05

[ moleculetype ]
; Name            nrexcl
ICE                 3

i've obtain warns

WARNING 1 [file lattice.top, line 23]:
   Overriding atomtype CH2


WARNING 2 [file lattice.top, line 24]:
   Overriding atomtype CH3

does it mean that the params from topology.top will be used instead of
RTP file ?


Not from the .rtp file, but the .top is overriding the contents of 
ffnonbonded.itp.

-Justin

--
========================================

Justin A. Lemkul, Ph.D.
Research Scientist
Department of Biochemistry
Virginia Tech
Blacksburg, VA
jalemkul[at]vt.edu | (540) 231-9080
http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin

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