[gmx-users] g_helix not recognizing protein backbone

[MPID]

I am running g_helix on a run involving a 37 residue protein in the charmm
force field. It has two long alpha helical segments. I have tried running
g_helix with many different variations of commands and getting rid of PBC
effects, but I always get the same error:

Checking group System
There are 37 residues
There are 0 complete backbone residues (from 0 to 524)

-------------------------------------------------------
Program g_helix, VERSION 4.5.5
Source code file: /home/shared/installers/gromacs-4.5.5/src/tools/hxprops.c,
line: 388


Fatal error:
rnr==0

--------------------------------------------------------
Is rnr the number of peptide residues, or the number that are helical? In
either case, nothing I do can seem to make it different from 0. 

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