This is really bothering me! In the Dr. Venables and Dr. Ripley's book
"S Programming" Page 105
shows that
c(is(10,"integer"),is(10.5,"integer"))
[1] T F
But I try this in R 2.7.2 it shows
c(is(10,"integer"),is(10.5,"integer"))
[1] FALSE FALSE
Does anyone know what is going on here?
Appreciate,
Chunhao
Quoting Yihui Xie <[EMAIL PROTECTED]>:
Yes, everyone will agree "7" is an integer, but I don't think
computers will agree too :-) R thinks it's a double-precision number,
except when you explicitly specify it as an integer (say,
as.integer()).
class(7)
[1] "numeric"
is.double(7)
[1] TRUE
Regards,
Yihui
--
Yihui Xie <[EMAIL PROTECTED]>
Phone: +86-(0)10-82509086 Fax: +86-(0)10-82509086
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School of Statistics, Room 1037, Mingde Main Building,
Renmin University of China, Beijing, 100872, China
On Wed, Sep 24, 2008 at 12:40 PM, <[EMAIL PROTECTED]> wrote:
Hi R users
Is there anything wrong in "is" function? (R 2.7.2)
I believe that everyone will agree that "7" is an integer, right? but why R
shows 7 is not an integer
is.integer(7)
[1] FALSE
is(7,"integer")
[1] FALSE
is(as.integer(7), "integer")
[1] TRUE
Thank you very much in advance
Chunhao
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