Okay thanks to your help I figured it out and stuck the code in a function:
df.sample.exIDs = function(main.df, sample1.df, n, ID1.name, ID2.name) {
main.ID1.notin.ID2 = main.df[!main.df[,ID1.name] %in%
sample1.df[,ID2.name],]
sample2.df = main.ID1.notin.ID2[sample(nrow(main.ID1.notin.ID2), size=n),]
return(sample2.df)
}
Cheers,
Matt Dubins
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