Note this is only implemented in the 4.1-beta releases.

The rigid specification goes in the Geometry.Constraint block:

%block Geometry.Constraints
  rigid [1 -- 3]
  rigid [4 -- 10]
%endblock

"average" the force on atoms 1-3 and move 1-3 equivalently.
"average" the force on atoms 4-10 and move 4-10 equivalently.

For further details, please see the manual.


Den ons. 23. jan. 2019 kl. 22.04 skrev Mina Sedighi <msedi...@uwaterloo.ca>:

> Hello everyone,
>
>
> I have a system containing water molecules in which two kind of salts
> (ions) have been solved. I want to consider water and SO42- molecules rigid
> during relaxation process. In this regard, how can I use "rigid | molecule"
> command?
>
> Any help will be appreciated.
>
>
> Regards,
>
> Mina
>


-- 
Kind regards Nick

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