I've looked but I cannot find a more elegant solution.

I would like to be able to scan through a data.frame and remove multiple
and various instances of certain contents.

A trivial example is below.  It works, it just seems like there should be a
one line solution.

#Example data:
a <-
data.frame(V1=1:3,V2=c(paste(LETTERS[1],LETTERS[1:3],sep='')),options(stringsAsFactors
= FALSE))

#> a
# V1 V2
#1  1 AA
#2  2 AB
#3  3 AC

#Cumbersome solution (which would be even more cumbersome with real data)

indices.of.aa <- which(a$V2 %in% "AA")
indices.of.ab <- which(a$V2 %in% "AB")
indices.of.ac <- which(a$V2 %in% "AC")
a$V2 <- replace(a$V2, indices.of.aa, "c")
a$V2 <- replace(a$V2, indices.of.ab, "d")
a$V2 <- replace(a$V2, indices.of.ac, "e")

## output
#> a
#  V1 V2
#1  1  c
#2  2  d
#3  3  e

I know with the trivial example above there are extremely simple solutions
but my data.frame is a few thousand rows.
Thanks all.
Trevor

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