Message-ID: <90332569-2e20-e645-26de-9c2cd43eaea9@embl.de>
Date: 2018-09-20T06:19:53Z
From: Wolfgang Huber
Subject: A different error in sample()
In-Reply-To: <SYCPR01MB41112555F67E1CAD438FCB6BCD1C0@SYCPR01MB4111.ausprd01.prod.outlook.com>
Besides wording of the documentation re truncating vs rounding, there
is something peculiar going on with the fractional part of n:
> table(sample.int(2.5, 1e6, replace = TRUE))
1 2 3
399051 401035 199914
> table(sample.int(3, 1e6, replace = TRUE))
1 2 3
332956 332561 334483
> table(sample.int(2.01, 1e6, replace = TRUE))
1 2 3
497173 497866 4961
> sessionInfo()
R Under development (unstable) (2018-09-17 r75319)
Platform: x86_64-apple-darwin17.7.0 (64-bit)
Running under: macOS High Sierra 10.13.6
Matrix products: default
BLAS: /Users/whuber/R/lib/libRblas.dylib
LAPACK: /Users/whuber/R/lib/libRlapack.dylib
locale:
[1] en_US.UTF-8/UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] fortunes_1.5-4
loaded via a namespace (and not attached):
[1] compiler_3.6.0 tools_3.6.0
20.9.18 03:00, Dario Strbenac scripsit:
> Good day,
>
> The use of "rounding" also doesn't make sense. If The number is halfway between two integers, it is rounded to the nearest even integer.
>
>> round(2.5)
> [1] 2
>
> --------------------------------------
> Dario Strbenac
> University of Sydney
> Camperdown NSW 2050
> Australia
--
With thanks in advance-
Wolfgang
-------
Wolfgang Huber
Principal Investigator, EMBL Senior Scientist
European Molecular Biology Laboratory (EMBL)
Heidelberg, Germany
wolfgang.huber at embl.de
http://www.huber.embl.de
My book with Susan Holmes: http://www.huber.embl.de/msmb