vel_plus_vel_cpp: Add two Velocities
Description
Add two Velocities
Usage
vel_plus_vel_cpp(vl1, vl2, abs_op)
Arguments
vl1
the first Velocity's causal list
vl2
the second Velocity's causal list
abs_op
the final number of 1,-1 operations
Value
a list with the Velocity's causal list and the number of operations