[gmx-users] angle calculation

SHAHEE ISLAM islamshahee at gmail.com
Mon Jun 18 15:24:42 CEST 2018

i want to calculate the angle between the two beeta sheet of a
protein.for this reason i have made a index file containing two beeta
sheet group.can anyone please suggest me how can i do this.
i am using this command
gmx gangle -f ../pbc340.xtc/md-340k-0-1 -s ../equilibration.gro -n
b-1-3-sheet-p1.ndx -oav angle.xvg -dt 10
the error is
Inconsistency in user input:
Number of positions in selection 1 in the first group not divisible by 3

thanking you

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