[Rd] Rounding in print.summaryDefault()

Joris Meys
2017-05-28T15:58:20Z

Might this be related to the Linux version? I'm testing on one of our
university servers, and they tend to be deprived of regular updates
sometimes... (Dirk, sorry for sending you this twice.)

> Sys.info()
                                    sysname
                                    "Linux"
                                    release
                           "3.16.0-4-amd64"
                                    version
"#1 SMP Debian 3.16.7-ckt11-1 (2015-05-24)"
                                   nodename
                                  "ourServer"
                                    machine
                                   "x86_64"
                                      login
                                   "me"
                                       user
                                   "me"
                             effective_user
                                   "me"

On Sun, May 28, 2017 at 5:51 PM, Dirk Eddelbuettel <edd at debian.org>
wrote:

>
> On 28 May 2017 at 17:37, Arne Henningsen wrote:
> | Dear all
> |
> | I am happy that summary.default() no longer rounds since R 3.4.0.
> |
> | However, in R 3.4.0, in a few cases, print.summaryDefault() rounds the
> | mean value (and the median value) differently on my GNU/Linux machine
> | and on my colleague's MS-Windows machine. Here is a small
(simplified)
> | reproducible example:
> |
> | R> a <- 1234568.01 + c(0:1)
> | R> summary(a)
> |
> | Output on MS-Windows (expected rounding of the mean value):
> |    Min. 1st Qu.  Median    Mean 3rd Qu.    Max.
> | 1234568 1234568 1234569 1234569 1234569 1234569
> |
> | Output on GNU/Linux (unexpected rounding of the mean value):
> |    Min. 1st Qu.  Median    Mean 3rd Qu.    Max.
> | 1234568 1234568 1234568 1234568 1234569 1234569
>
> Not here:
>
> R> a <- 1234568.01 + c(0:1)
> R> a
> [1] 1234568 1234569
> R> summary(a)
>    Min. 1st Qu.  Median    Mean 3rd Qu.    Max.
> 1234568 1234568 1234569 1234569 1234569 1234569
> R> Sys.info()
>                                       sysname
>                                       "Linux"
>                                       release
>                            "4.8.0-39-generic"
>                                       version
> "#42-Ubuntu SMP Mon Feb 20 11:47:27 UTC 2017"
>                                      nodename
>                                         "max"
>                                       machine
>                                      "x86_64"
>                                         login
>                                         "edd"
>                                          user
>                                         "edd"
>                                effective_user
>                                         "edd"
> R>
>
> Ubuntu 16.10, 64bit.
>
> Dirk
>
> | The following code gives the same output on MS-Windows and on GNU/Linux:
> | R> print(summary(a), digits=9)
> |     Min.   1st Qu.    Median      Mean   3rd Qu.      Max.
> | 1234568.0 1234568.3 1234568.5 1234568.5 1234568.8 1234569.0
> | R> summary(a)["Mean"]
> |   Mean
> | 1234569
> | R> mean(a)
> | [1] 1234569
> | R> print(mean(a), digits=9)
> | [1] 1234568.51
> |
> | Can these outputs be reproduced by other GNU/Linux and MS-Windows users?
> |
> | If these differences can be reproduced by others: Should these
> | differences in the output on GNU/Linux and MS-Windows be considered as
> | a bug?
> |
> | Does anybody know how one can avoid to get different roundings in the
> | outputs of summary() on different computers?
> |
> | Best,
> | Arne
> |
> | --
> | Arne Henningsen
> | http://www.arne-henningsen.name
> |
> | ______________________________________________
> | R-devel at r-project.org mailing list
> | https://stat.ethz.ch/mailman/listinfo/r-devel
>
> --
> http://dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>



--
Joris Meys
Statistical consultant

Ghent University
Faculty of Bioscience Engineering
Department of Mathematical Modelling, Statistics and Bio-Informatics

tel :  +32 (0)9 264 61 79
Joris.Meys at Ugent.be
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