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fix drag command

Syntax:

fix ID group-ID drag x y z fmag delta 

Examples:

fix center small-molecule drag 0.0 10.0 0.0 5.0 2.0 

Description:

Apply a force to each atom in a group to drag it towards the point (x,y,z). The magnitude of the force is specified by fmag. If an atom is closer than a distance delta to the point, then the force is not applied.

Any of the x,y,z values can be specified as NULL which means do not include that dimension in the distance calculation or force application.

This command can be used to steer one or more atoms to a new location in the simulation.

Restrictions: none

Related commands:

fix spring

Default: none