IP-Address
IP addresses are very (very!) difficult to parse and sort correctly
because there are all sorts of supported formats. Try to use something
like PostgreSQL instead: it is already implemented there. But if you
are sure all your data is of the n.n.n.n form, then something along the
lines of the following should basically work (I have chosen some more
interesting IP addresses for this):
a <- data.frame(cbind(id=c(138,138,138,138),
rank=c(29746,29746,29746,29746),
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")))
a
# id rank color status ip
# 1 138 29746 yellow no 162.131.58.26
# 2 138 29746 red yes 2.131.58.16
# 3 138 29746 blue yes 2.2.58.10
# 4 138 29746 red no 162.131.58.17
x <- matrix(unlist(lapply(strsplit(as.character(a$ip), ".", fixed=TRUE),
as.integer)),
ncol=4, byrow=TRUE)
a[order(x[,1],x[,2],x[,3],x[,4]),]
# id rank color status ip
# 3 138 29746 blue yes 2.2.58.10
# 2 138 29746 red yes 2.131.58.16
# 4 138 29746 red no 162.131.58.17
# 1 138 29746 yellow no 162.131.58.26
Getting rid of the conversions including the matrix(unlist) combo is
left as an exercise (it's too hot here....)
Allan.
edwin Sendjaja wrote:
Hi,
Is there any way to sort a tabel with a colum with IP-address?
table:
id rank color status ip
138 29746 yellow no 162.131.58.26
138 29746 red yes 162.131.58.16
138 29746 blue yes 162.131.58.10
138 29746 red no 162.131.58.17
138 29746 yellow no 162.131.58.14
138 29746 red no 162.131.58.13
138 29746 yellow no 162.132.58.15
139 29746 green no 162.252.20.69
140 29746 red yes 162.254.20.71
141 29746 yellow no 163.253.7.153
142 31804 green yes 163.253.20.114
144 32360 black yes 161.138.45.226
....
Unfortunately, order doesn't work as I want.
I found an half solusion from John:
mysort <- function(x){
sort.helper <- function(x){
prefix <- strsplit(x, "[0-9]")
prefix <- sapply(prefix, "[", 1)
prefix[is.na(prefix)] <- ""
suffix <- strsplit(x, "[^0-9]")
suffix <- as.numeric(sapply(suffix, "[", 2))
suffix[is.na(suffix)] <- -Inf
remainder <- sub("[^0-9]+", "", x)
remainder <- sub("[0-9]+", "", remainder)
if (all (remainder == "")) list(prefix, suffix)
else c(list(prefix, suffix), Recall(remainder))
}
ord <- do.call("order", sort.helper(x))
x[ord]
}
mysort (data$ip) captured only the ip-adresse. How can I capture the whole table and sorted?(ID rank color status ip)
Thank you in advance.
eddie
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