### patch-at

#### patch-at dx dy

Reports the patch at (dx, dy) from the caller, that is, the patch containing the point dx east and dy patches north of this agent.

Reports nobody if there is no such patch because that point is beyond a non-wrapping world boundary.

    ask patch-at 1 -1 [ set pcolor green ]
    ;; if caller is a turtle or patch, turns the
    ;;   patch just southeast of the caller green

See also patch, patch-ahead, patch-left-and-ahead, patch-right-and-ahead, patch-at-heading-and-distance.

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