[gmx-users] constrained minimization

[rob yang]

>From: David van der Spoel <spoel at xray.bmc.uu.se>

>rob yang wrote:
>>Dear list,
>>Is there a way to perform minimizations with 1 or more torsion angles 
>>frozen? Can ffscan do it? If so, where would I find an example file on the 
>>"param.dat" file that's needed for ffscan? Thank you very much in advance.
>>
>Maybe you can do it by adding constraints, but only using mdrun.
>ffscan is for force field optimization.
>

Thanks David. 2 fold questions in response to that:
1) unless i am missing something, there's no torsion constraints available 
(just position, angle constraints) in gromacs
2) i am trying to improve force field torsion parameters to suit my molecule 
better, so does that count as force field optimization? just out of 
curiocity, is there an example for using the ffscan function?

thank you.

rob