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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