[gmx-users] g_bundle problem

Justin A. Lemkul jalemkul at vt.edu
Fri Mar 19 02:47:24 CET 2010

Justin A. Lemkul wrote:
> Stefan Hoorman wrote:
>> I have tried using g_bundle in order to analyse helix axes in my 
>> transmembran helices. I created two groups in my ndx file that 
>> included the alpha carbons of the first half of my helix and a second 
>> group for the alpha carbons for the second half. When I try using 
>> g_bundle the following error comes up:
>> "Fatal error:
>> The size of one of your index groups is not a multiple of n"
>> What am I doing wrong?
> Not a clue - What is your exact command line?  How many atoms are in 
> each index group?  The value of n is the number of parts into which the 
> axes are divided and there are several criteria in the code that must be 

*Edit* The value of n is the number of parts into which the *groups* are 
divided, not the axes...been one of those days, sorry.



Justin A. Lemkul
Ph.D. Candidate
ICTAS Doctoral Scholar
Department of Biochemistry
Virginia Tech
Blacksburg, VA
jalemkul[at]vt.edu | (540) 231-9080


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