How extract the names of ID in SpatialPolygons object

Hi dear user,

Anybody can tell me how extract the names of ID in  SpatialPolygons  
object,  I am try to link a data frame attributes with spatial polygons, 
but the row names of data frame is not the same that ID poligons.

The most generic way is to extract the "polygons" slot from your object 
and then the "ID" from each member "Polygons" in turn - using sapply 
because you want a character vector returned, one ID for each list member:

sapply(slot(mySpatialPolygons, "polygons"), function(x) slot(x, "ID"))

but there is an access function too:

getSpPPolygonsIDSlots()

which is just the above with a name.

Roger

Thank for all

Fernando

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