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Someone on the R-help mailing list had a data frame with a column containing IP addresses in quad-dot format (e.g. 1.10.100.200). He wanted to sort by this column and I proposed a solution involving strsplit
. But Peter Dalgaard comes up with a much nicer method using read.table
on a textConnection
object:
> a <- data.frame(cbind(color=c("yellow","red","blue","red"), status=c("no","yes","yes","no"), ip=c("162.131.58.26","2.131.58.16","2.2.58.10","162.131.58.17"))) > con <- textConnection(as.character(a$ip)) > o <- do.call(order,read.table(con, sep=".")) > close(con) > a[o,] color status ip 3 blue yes 2.2.58.10 2 red yes 2.131.58.16 4 red no 162.131.58.17 1 yellow no 162.131.58.26
That is very, very neat! Thank you Peter.
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