R help - Feb 2009 - Does the "labpt" object in the Polygons-class represent the centroid of the polygon

Hello,

I need to calculate the centroids of some spatial polygons that I have
placed into a Polygons-class object.  Is the labeling point in the
Polygons-class the centroid of the polygon?

Thank you for your help.

<Rizzo.Michael <at> epamail.epa.gov> writes:
> 
> I need to calculate the centroids of some spatial polygons that I have
> placed into a Polygons-class object.  Is the labeling point in the
> Polygons-class the centroid of the polygon?
> 
Yes. The class documentation at ?"Polygons-class" does not state that
this is
the case, because other points might be validly inserted as label points. The 
default constructor uses the centroid of the largest non-hole ring in the 
Polygons object.

Roger Bivand

> Thank you for your help.
>