r - How to populate missing match value -

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i using match function when match not found want text returned:

input

map<-c("hi","bye") r<-data.frame(x= c("bye","hi",3909090)) r$y<- c(100,200,300) r r$matchcolumn  <- map[ match(r$x,map)  ] r is.na(r$matchcolumn)

output

> r         x   y 1     bye 100 2      hi 200 3 3909090 300 > r$matchcolumn  <- map[ match(r$x,map)  ] > r         x   y matchcolumn 1     bye 100         bye 2      hi 200          hi 3 3909090 300        <na>  ####################### can see na here > is.na(r$matchcolumn) [1] false false  true

i want r this:

> r         x   y matchcolumn 1     bye 100         bye 2      hi 200          hi 3 3909090 300        missing data

i want thinking use is.na(r$matchcolumn) somehow idea?

thank you.

is you're looking for?

r$matchcolumn[is.na(r$matchcolumn)] <- 'missing data'

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