[R] How to test if t[["cat"]] exists ?

From: Ng Stanley <stanleyngkl_at_gmail.com>
Date: Wed, 16 Apr 2008 09:53:07 +0800


> t <- list("cat"=1)
> exists("t")

[1] TRUE

> exists("t[["cat"]]")

Error: unexpected symbol in "exists("t[["cat"
> exists("t[[\"cat\"]]")

[1] FALSE Thanks

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