Hi,
This may be the answer to your question
https://mailman-1.sys.kth.se/pipermail/gromacs.org_gmx-users/2004-February/009490.html
Best regards
Alessandra

On Mon, Mar 16, 2020 at 7:05 PM Sadaf Rani <sadafra...@gmail.com> wrote:

> Dear Gromacs users
>
> I am calculating a dihedral angle between certain atoms by following
> command:-
>
> gmx angle -type dihedral -f md_1000ps.xtc -n dihedral.ndx -ov group.xvg -of
> trans.xvg
>
> Group     0 (      dihedral1) has     4 elements
> Group     1 (      dihedral2) has     4 elements
> Group     2 (      dihedral3) has     4 elements
> Select a group: 2
> Selected 2: 'dihedral3'
> I get a warning as below:-
> Warning: calculating fractions as defined in this program
> makes sense for Ryckaert Bellemans dihs. only. Ignoring -of
>
> What does it mean? Can anyone please help me to understand? I am using
> gromacs 2020
>
> Thanks.
> Sadaf
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