Marc Schwartz wrote:
On Jun 20, 2009, at 5:44 PM, Henrik Bengtsson wrote:
Hi, this is a bit of FYI, but also a question.
Is flag '#' in sprintf() format string "%#x" fully supported across
platforms? Can that be assumed? I discovered thanks to the r-forge
service, that this was not the case for OSX with "R version 2.9.0
Under development (unstable) (2009-01-13 r47593)", where R CMD check
reports the following:
Error in sprintf("%#x", values) :
use format %d, %i, %x or %X for integer objects
where values <- as.integer(1:5). Note it works well on other
platforms; I don't know about newer R version on OSX. Should I
consider this a glitch in an old version of R (newer R version do a
much better validation here), or should I simply avoid '#'?
Thanks,
/Henrik
Henrik,
Using:
R version 2.9.0 Patched (2009-06-05 r48712)
on a fully updated OSX 10.5.7 MacBook Pro:
values <- 1:5
> sprintf("%#x", values)
[1] "0x1" "0x2" "0x3" "0x4" "0x5"
Note that the as.integer() is not needed, as ':' will return integers if
both from and to values are integers:
That is obviously true, but
> is.integer(1)
> FALSE
> is.integer(1:5)
> TRUE
and, surprisingly,
> is.integer(1.0:5.2)
> TRUE
Documentation of ":" says, about 'Value':
"For numeric arguments, a numeric vector. This will be of type
'integer' if 'from' and 'to' are both integers and representable
in the integer type, otherwise of type 'numeric'.
This is true, but not the full truth. Instead it should read
"...This will be of type 'integer' if 'from' is representable in the
integer type, otherwise of type 'double'"
Göran
--
Göran Broström phone: 46 90 786 5223; 46 705 197 507
Department of Statistics fax: 46 90 786 6614
Umeå University email: g...@stat.umu.se
SE-90187 Umeå, Sweden http://tal.stat.umu.se/~gb
______________________________________________
R-devel@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel
