[gmx-users] make index group

Mark Abraham Mark.Abraham at anu.edu.au
Wed Jul 1 13:50:45 CEST 2009

Bing Bing wrote:
> Dear all,
> I'm trying to perform order parameter analysis. I 've use :-
> make_ndx_d -f xxx.tpr -o sn1.ndx
>  > 15 & a Cxx |.......
>  >q
> i've got this error :-
> Group 15 not exist.

So use a group that does exist. If you're copying an index group 
creation recipe from some tutorial, go back to that and understand what 
this step is designed to achieve, and then adjust it to suit your new 


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