[gmx-users] empty index group

[David Newman]

Hi,

So on Gromacs 4.6.5, I'm using the make_ndx command to try to create a custom index of a binding pocket on my protein of interest, I want to group 5 non-contiguous residues, I can index them separately and tried to group them with & but that creates an empty group error because I guess it is for linking separate options together not separate instances of the same option. Is there a way to achieve what I'm after?

Thanks,

David