arezoo rahmanpour wrote:
Hi,
Upon running

g_helix_d -s md.tpr -n md.ndx -f md.trr

I got the following output:

Fatal error:
rnr==0.

Please tell me how can I proceed?


The error indicates that g_helix has identified zero residues on which it can operate. Most likely whatever index group you've selected is not suitable for the analysis.

-Justin

--
========================================

Justin A. Lemkul
Ph.D. Candidate
ICTAS Doctoral Scholar
MILES-IGERT Trainee
Department of Biochemistry
Virginia Tech
Blacksburg, VA
jalemkul[at]vt.edu | (540) 231-9080
http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin

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