[R] how to judge a virable is a integer?

[PO SU]

It's due to that, 1 is a numeric, 1.2 is a numeric, though it's true. but deeply, when i want to know 1 is an integer,  there seems no easy way to get the answer.
So, is there anyone happen to know it?




--

PO SU
mail: desolator88 at 163.com 
Majored in Statistics from SJTU



At 2014-10-18 20:10:09, "S Ellison" <S.Ellison at LGCGroup.com> wrote:
>> But i use a<-10/b ,  b is some value ,may be  5, maybe 5.5
>If you do floating point arithmetic on integers you'll usually get floating point answers, including the 5.0.
>
>See FAQ 7.31 for the usual floating point problem, and ?all.equal for the usual answer to it. You could see if a result is close to an integer by,for example, using all.equal to compare it to itself after rounding.
>
>S
>
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