Nothing
setClass("SpatialPolygonsDataFrame",
contains = "SpatialPolygons",
slots = c(data = "data.frame"),
validity = function(object) {
if (!inherits(object@data, "data.frame"))
stop("data should be of class data.frame")
if (nrow(object@data) != length(object@polygons))
stop("number of rows in data.frame and polygons in SpatialPolygons don't match")
return(TRUE)
}
)
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