CODEWITHSUNDEEP
rpastesapply
dmvianna
dmvianna

Reputation: 15718

sapply paste before at beginning of string

So I have a vector

lizt <- c("a","b","c")

> lizt
[1] "a" "b" "c"

and I can use sapply to paste characters after each element

lizt2 <- sapply(lizt,paste0, "$", USE.NAMES=F)

lizt2
[1] "a$" "b$" "c$"

now, how do I use a similar function to paste characters before each element, so I get

lizt3
[1] "^a$" "^b$" "^c$"

Upvotes: 8

Views: 7957

Answers (2)

GSee
GSee

Reputation: 49820

As mnel showed, you do not need to use sapply here, but if you want to anyway, you can create your own custom function to use with sapply like this:

> sapply(lizt, function(x) paste0("^", x, "$"), USE.NAMES=FALSE)
[1] "^a$" "^b$" "^c$"

Upvotes: 5

mnel
mnel

Reputation: 115390

paste and paste0 are vectorized, so you don't need sapply

paste0('^', lizt, '$')
## [1] "^a$" "^b$" "^c$"

Upvotes: 16

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