r - Creating a comma separated vector

Question

I have a numeric vector, one, which I'm trying to turn into a character vector where each element is separated by commas.

> one = c(1:5)
> paste(as.character(one), collapse=", ")
[1] "1, 2, 3, 4, 5"
> paste(as.character(one), sep="' '", collapse=", ")
[1] "1, 2, 3, 4, 5"

However, I want the output to look like:

"1", "2", "3", "4", "5" 

Am I missing some parameter from the paste function? Help!?

Answer 1

shQuote is probably the best way to do this. Specifically, this gets you the output you want:

cat(paste(shQuote(one, type="cmd"), collapse=", "))

If single quotes are fine, you can use:

paste(shQuote(one), collapse=", ")

type="cmd" actually provides escaped quotes, which is what's actually useful for most contexts, but if you really want to display it somewhere with unescaped quotes, cat provides that.