Constraints with GEO_OPT do not work (FIST calculation)

Matt W MattWa... at
Wed Jun 29 12:38:53 UTC 2011

Hi Gabriele ,

as a quick workaround make the atoms you want to fix rigid ions.

Seems to me that the fixed ion routines (fix_atom_control) only zero the 
forces on particles, but the forces on cores and shells are separate 
thingies, so an extra bit of logic needs to go in. This only really matters 
if you wanted to have the shells relax, but the cores remain fixed - 
otherwise changing to rigid ions causes no problems.


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