[gmx-users] Justin umbrella sampling tutorial......

[rama david]

Hi Gromacs Friends,

   I am performing justin tutorial for umbrella sampling ..
http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin/gmx-tutorials/umbrella/05_pull.html
I encounter with following problem while using the disatances.pl script

1. After command perl distances.pl  I got following message ...


   Use of uninitialized value $distance in concatenation (.) or string at
distances.pl line 30.
   readline() on closed filehandle IN at distances.pl line 16.
  What may be reason for these ..
2. What is the groups.txt ??
   Where it will find ?? Why it is needed??
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