What defines a motion as a linear motion in robotics?

A linear motion in robotics is characterized by a straight path without any deviation. This means that during linear motion, the end effector of the robot or the object being moved travels along a single, consistent trajectory in one direction, maintaining a constant velocity. The definition of linear motion hinges on this straight path; any alteration or deviation from a straight line would no longer represent linear motion.

In contrast, the other options do not accurately define linear motion. The involvement of complex algorithmic calculations pertains more to the planning and execution of motion, rather than the nature of linear motion itself. Multiple waypoints suggest movements that change direction at various points, which aligns more with path planning or non-linear motion. Lastly, defining the path only on a two-dimensional plane restricts the concept of linear motion to a limited space; linear motion can occur in three dimensions as well.