From: Khuong Truong Gia (
Date: Mon Apr 18 2016 - 06:34:57 CDT

Dear Jerome,

Yes, I have predefined groups of atoms and I want to select with my
criterion in one selection. But It may impossible. So I made a script for
doing that.
Thank you for your reply.

Best regards,

On Mon, Apr 18, 2016 at 6:17 PM, Jérôme Hénin <> wrote:

> If I understand correctly, you have predefined groups of atoms, then I
> think you can't avoid a little bit of scripting, eg. calculating the center
> of mass of every group and testing each one for your criterion.
> Jerome
> On 17 April 2016 at 11:32, Khuong Truong Gia <> wrote:
>> Dear all,
>> I want to select a group of atoms that the z of center of mass of the
>> group is below Zo value.
>> Is it possible in VMD.
>> Thank you very much,
>> Khuong