| velocity_constraint | R Documentation | 
This constraint puts bounds on the magnitude of velocity a particle can have. Particles where either end of the bound is NA ignores the constraint. If a particle with no velocity is forced to have a velocity the direction will be random.
The following parameters defines the training of the constraint and can be
passed along a call to impose()
v : The velocity allowed for the particle. (tidy eval)
vmin : The lowest permissible velocity. If NULL then v will be used. (tidy eval)
vmax : The highest permissible velocity. If NULL then v will be used. (tidy eval)
Other constraints: 
dominator_constraint,
infinity_constraint,
path_constraint,
polygon_constraint,
x_constraint,
y_constraint
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