Filtering a data frame by factors in R

Question

I have the following dataframe:

sp <- combn(c(\"sp1\",\"sp2\",\"sp3\",\"sp4\"),2)
d <- data.frame(t(sp),\"freq\"=sample(0:100,6))

and

Answer 1

You are almost there:

d[d$X1 %in% x1 & d$X2 %in% x2,]