[R] Is there a function that print a string vertically (by adding "\n")?

[jpm miao]

Hi,

  I'd like to print a string vertically. For example, I would like to print
"abcd" as  "a\nb\nc\nd"

  Is there a function in R such that

Input: "abcd"
Output: "a\nb\nc\nd"?

   Thanks,

Miao

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