Extracting points with polygon in R

Question

I\'m trying to extract points by a polygon using the \'sp\' package function \'over\'

library(sp)
library(rgeos)
#my polygon plgn (many polygon features in o         


        

Answer 1

Your plgn is a SpatialPolygonsDataFrame, and as such, is.na(over(d, plgn)) returns a logical matrix. This cannot be used to subset your SpatialPoints*. You can do the following to convert the logical matrix to a vector that the subsetting operation can accommodate:

d[complete.cases(over(d, plgn)), ]