On 10/05/2014, 6:46 AM, Barry Rowlingson wrote:
On Fri, May 9, 2014 at 10:42 PM, Hadley Wickham <h.wick...@gmail.com> wrote:
Beware of the is.* functions:
* is.object() does not test the usual definition of objects
* is.vector() does not test the usual definition of vectors
* is.numeric() does not work the same way as is.character() or is.integer()
* is.Date() doesn't exist
* is.nan() doesn't return TRUE for some NaNs
Can we have an "is.is" function that tells us these things?
> is.is(is.object)
[1] FALSE
Warning: is.object() does not test the usual definition of objects
> is.is(is.is)
[1] TRUE
For further exploration, demo("is.things") creates a handy "is.ALL"
function that outputs the result of running a lot of is.X functions on
its argument.
I tried to write it, but the trouble is, is.is(is.is) is FALSE.
Duncan
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