On 11/04/2014, 5:04 AM, peter dalgaard wrote:
Google for "round to even", and read the Details section of ?round.
The behaviour on the Linux laptop does sound problematic, if it is
really giving round(4.5) = 5. We do have the warning there that it
depends on OS services, but this could cause other problems.
Duncan Murdoch
On 11 Apr 2014, at 10:42 , Per Nielsen <evil...@gmail.com> wrote:
Hi all
I have encountered some strange/wrong behavior of the round function in R.
This is the behavior on my mac laptop:
R.version
_
platform x86_64-apple-darwin13.0.2
arch x86_64
os darwin13.0.2
system x86_64, darwin13.0.2
status
major 3
minor 0.2
year 2013
month 09
day 25
svn rev 63987
language R
version.string R version 3.0.2 (2013-09-25)
nickname Frisbee Sailing
round(1.5)
[1] 2
round(4.5)
[1] 4
floor(1.5 + 0.5)
[1] 2
floor(4.5 + 0.5)
[1] 5
This is the behavior on Ubuntu 12.04 running in a virtual machine on the
same mac:
R.version
_
platform x86_64-pc-linux-gnu
arch x86_64
os linux-gnu
system x86_64, linux-gnu
status beta
major 3
minor 1.0
year 2014
month 03
day 28
svn rev 65330
language R
version.string R version 3.1.0 beta (2014-03-28 r65330)
nickname Spring Dance
round(1.5)
[1] 2
round(4.5)
[1] 4
floor(1.5 + 0.5)
[1] 2
floor(4.5 + 0.5)
[1] 5
I would expect round(x.5) = x+1, which only happens sometimes. My colleague
using R version 3.1.0 on Linux on a Lenovo laptop gets the expected result
in all cases.
Is this a bug or somehow expected behavior? It seems to be related to the
mac hardware. I can ad hoc fix it using floor, but that is hardly optimal.
Thanks,
Per
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