[Rd] Reading Inf and NaN values under windows (PR#1072)
plummer@iarc.fr
plummer@iarc.fr
Fri, 24 Aug 2001 11:56:35 +0200 (MET DST)
Under windows, R supports IEEE floating point arithmetic, but doesn't
allow conversion of Inf and NaN from character to numeric.
R> is.nan(NaN)
[1] TRUE
R> as.numeric(as.character(NaN))
[1] NA
Warning message:
NAs introduced by coercion
R> is.infinite(Inf)
[1] TRUE
R> as.numeric(as.character(Inf))
[1] NA
Warning message:
NAs introduced by coercion
whereas under Linux
R> as.numeric(as.character(NaN))
[1] NaN
R> as.numeric(as.character(Inf))
[1] Inf
S-PLUS 3.3 for Windows gives
S-PLUS> as.numeric(as.character(Inf))
[1] Inf
S-PLUS> as.numeric(as.character(NaN))
[1] NA
Warning messages:
1 missing value generated coercing from character to numeric in:
as.numeric(as.character(NaN))
I first came across this problem when trying to read in a dataset with
Inf values using read.table(). Under Windows, the variable with the
infinite value is converted to a factor. The scan() function also refuses
to read in Inf and NaN as numeric values under Windows.
Martyn
--please do not edit the information below--
Version:
platform = i386-pc-mingw32
arch = x86
os = Win32
system = x86, Win32
status =
major = 1
minor = 3.0
year = 2001
month = 06
day = 22
language = R
Windows NT 4.0 (build 1381) Service Pack 6
Search Path:
.GlobalEnv, package:ctest, Autoloads, package:base
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