Objects of class
area are used to store the information on
the shape of vectorised objects.
An object of class
area is a data frame with three variables.
The first variable is a factor defining the polygons.
The second and third variables are the xy coordinates of the polygon vertices in the order where they are found. This kind of objects are current in the package
ade4, though this package
does not define
area as a special class.
a data frame with three columns
Returns an object of class
1 2 3
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