[gmx-users] Number of degrees of freedom for generating velocities

[Esteban Vöhringer]

Hi,

I was looking into the code, how the velocities are generated in  
grompp, once the option genvel is used in the .mdp file.
I don't understand why the number of degrees of freedom which are  
used to calculate the scaling factor for the random velocities is 3N  
and not 3N-Nc ( Nc= Number of constraitns; N=Number of atoms).
is there some special reason?

Tank you in advance for your help

Esteban

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