[R-sig-Geo] Extract part(s) of SpatialPolygonsDataFrame

[sylvain willart]

Great,
I didn't know about the use of '@'
Thank you

Sylvain

2010/5/13 Carson Farmer <carson.farmer at gmail.com>:
> Hi,
>
>> I only need, for now, to work on two areas: Burgundy and Centre,
>> I would like to extract those two areas from the France file,
>> I tried, naïvely,
>> Centre <- France[France$NAME_1=="Centre", ]
>
> try:
>> Centre <- France[France at data$NAME_1=="Centre",]
>
>> PS: I found quite a lot of information on points, ploygons, or lines,
>> but few on spatialpolygonsdataframe besides they are "a set of spatial
>> polygons", Any reference on their inside structure ?
>
> see:
>> ?SpatialPolygonsDataFrame
> A SpatialPolygonsDataFrame is made up of a data.frame and an object of
> class SpatialPolygons, which is a list of objects of class Polygons,
> which is made up of a list with Polygon class objects.
> You can use getSlots to list the available slots of the various object types.
>> ?getSlots
>
> Regards,
>
> Carson
>