list or rtable containing two values or GridPoint object
directed : indicates directed segment; default is false
The Segment constructor generates and returns an object that represents a segment in 2-D space.
If the directed=true option is provided, this means that the segment is directed and grading takes into account the order of the points.
<< Segment: [[3.5, -2.0], [8.2, 4.6]]>>
The Grading:-Segment command was introduced in Maple 18.
For more information on Maple 18 changes, see Updates in Maple 18.
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