Turtle and Observer Command

-at xcor ycor

Any command which ends in -at is caller relative. If called by the observer, xcor ycor are relative to where the observer is (i.e. at 0 0). If called by a turtle, xcor ycor are relative to where the turtle is.
Example:
Observer: count-turtles-at 1 4 returns the number of turtles at 1 4.
Turtle: count-turtles-at 1 4 returns the number of turtles that are 1 positive x-coordinate and 4 postive y-coordinates away from the caller turtle.

Related commands: