Qiang Zhong wrote:
Hollow:
      I have post my question last time,my emailbox can not work, So I post
again.
I have 4 calcium ions bind at  protein, when I use command:
 grompp  -f fullmd_sol.mdp -c minimized_water.gro -p cln.top -o fullmd.tpr

I got error message:
Fatal error:
4 atoms are not part of any of the T-Coupling groups

I got a advice to use :
make_ndx   -f  minimized_water.gro

Then I got a file index.ndx
I find the line in index.ndx ,just like below:
57378 57379 57380 57381 [ CA ] 1 2 3 4 [ SOL ]
Then I delete them,and run again:

That wasn't the advice Yang Ye gave you... see http://www.gromacs.org/pipermail/gmx-users/2007-February/025792.html

For a simpler solution, see http://www.gromacs.org/pipermail/gmx-users/2007-February/025796.html

Mark
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