From phgrosjean@sciviews.org  Wed Jan  8 11:25:03 2003
From: phgrosjean@sciviews.org (phgrosjean@sciviews.org)
Date: Wed Jan  8 11:25:03 2003
Subject: [Rd] Undocumented bahavior of as.integer() (PR#2430)
Message-ID: <200301081024.LAA24951@pubhealth.ku.dk>

as.integer() truncates doubles toward zero, as Splus does (at least v. 6.1
under Windows does). Thus:

> look <- (10 * seq(14)) - 76
> 10 * (73.1 + look)
 [1]   71  171  271  371  491  586  681  791  886  981 1101 1201 1301 1401
> as.integer(10 * (73.1 + look))
 [1]   70  170  270  370  490  586  681  791  886  981 1101 1201 1301 1401

... It is not documented in R! I propose appending the following to
as.integer.Rd:

\section{ WARNING }{ During coercion of doubles, real numbers are not
rounded but truncated (the closest integer towards zero is returned).
Attributes are deleted.}

And I suggest adding the previous exemple in the corresponding section in
as.integer.Rd. Moreover, the subset operation [] uses as.integer() and
consequently, can suffer from the same syndrome. A WARNING section in
Extract.Rd would be welcome too.


Version:
 platform = i386-pc-mingw32
 arch = i386
 os = mingw32
 system = i386, mingw32
 status =
 major = 1
 minor = 6.1
 year = 2002
 month = 11
 day = 01
 language = R

Windows XP Professional (build 2600) Service Pack 0.0

Search Path:
 .GlobalEnv, package:ctest, Autoloads, package:base


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[Rd] Undocumented bahavior of as.integer() (PR#2430)
phgrosjean@sciviews.org