[gmx-users] contact analysis within the all backbone of a protein

[SHAHEE ISLAM]

hi,
to calculate the contact between the all backbone of a protein ,is the
following command is correct
 gmx mindist -f dynamic.xtc -s equilibration.gro -n bb-p.ndx -dt 1000
-d 0.5 -on contact.xvg -od mindist.xvg
because after entering this command i have to select the same group
for two times.
  Using this command i can calculate no of contacts between two group
by selecting two different group.
My question is, can i calculate all the backbone contact within a same
protein by selecting the same group for two times.

thanking you
shahee