On 10 May 2014, at 12:54 , Duncan Murdoch <murdoch.dun...@gmail.com> wrote:
> 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
Worse,
is.is(mybaby) | is.aint(mybaby)
comes out TRUE whatever the value of mybaby.
--
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Email: pd....@cbs.dk Priv: pda...@gmail.com
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