integer
Adrian, Yes, any "whole" number coming out of a computation bitten by floating point issues, I think.
x = 1/49*49 x
[1] 1
x%%1
[1] 1
is.wholenumber <-
+ function(x, tol = .Machine$double.eps^0.5) abs(x - round(x)) < tol
is.wholenumber(x)
[1] TRUE Best, ~G P.S Credit to Hadley Wickham for recently pointing out on twitter that 49 is the first number like this. I would have had to have gone searching for one otherwise.
On Thu, Dec 17, 2015 at 7:02 AM, Adrian Du?a <dusa.adrian at unibuc.ro> wrote:
In the help page for ?is.integer, there is this function
is.wholenumber <-
function(x, tol = .Machine$double.eps^0.5) abs(x - round(x)) < tol
A quick question: is there a case where this alternative function will not
work?
function(x) x %% 1 == 0
Best,
Adrian
--
Adrian Dusa
University of Bucharest
Romanian Social Data Archive
Soseaua Panduri nr.90
050663 Bucharest sector 5
Romania
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