Simple lookup to insert values in an R data frame

Question

This is a seemingly simple R question, but I don\'t see an exact answer here. I have a data frame (alldata) that looks like this:

Case     zip     market
1              


        

Answer 1

With such a large data set you may want the speed of an environment lookup. You can use the lookup function from the qdapTools package as follows:

library(qdapTools)
alldata$market <- lookup(alldata$zip, zipcodes[, 2:1])

Or

alldata$zip %l% zipcodes[, 2:1]