sprintf() question
Hi The result of Windows is clearly strange. ================ my Linux machine =?good =======================
sessionInfo()
R version 2.9.0 (2009-04-17) x86_64-pc-linux-gnu locale: LC_CTYPE=ja_JP.EUC-JP;LC_NUMERIC=C;LC_TIME=ja_JP.EUC-JP;LC_COLLATE=ja_JP.EUC-JP; LC_MONETARY=C;LC_MESSAGES=ja_JP.EUC-JP;LC_PAPER=ja_JP.EUC-JP;LC_NAME=C;LC_ADDRES S=C;LC_TELEPHONE=C;LC_MEASUREMENT=ja_JP.EUC-JP;LC_IDENTIFICATION=C attached base packages: [1] stats graphics grDevices utils datasets methods base
sprintf("%a",1:8)
[1] "0x1p+0" "0x1p+1" "0x1.8p+1" "0x1p+2" "0x1.4p+2" "0x1.8p+2" "0x1.cp+2" [8] "0x1p+3" ================ my Windows machine = OMG ======================
sessionInfo()
R version 2.9.0 (2009-04-17) i386-pc-mingw32 locale: LC_COLLATE=Japanese_Japan.932;LC_CTYPE=Japanese_Japan.932;LC_MONETARY=Japanese_Japan.932;LC_NUMERIC=C;LC_TIME=Japanese_Japan.932 attached base packages: [1] stats graphics grDevices utils datasets methods base
sprintf("%a",1:8)
[1] "0x1p+0" "0x1" "0x1.8" "0x1p+4294967294" [5] "0x1.4p+4294967294" "0x1.8p+4294967294" "0x1.cp+4294967294" "0x1p+4294967293" The result improved when I changed handling of uExponent as follows http://prs.ism.ac.jp/~nakama/working/sprintf_format_a.patch 2009/5/18 Daniel Nordlund <djnordlund at verizon.net>:
-----Original Message----- From: Ted Harding [mailto:Ted.Harding at manchester.ac.uk] Sent: Sunday, May 17, 2009 3:32 PM To: Daniel Nordlund Cc: r-help at r-project.org Subject: RE: [R] sprintf() question On 17-May-09 22:03:19, Daniel Nordlund wrote:
When I type the following, I get results different from what I expected.
sprintf('%a',3)
[1] "0x1.8" Shouldn't the result be [1] "0x1.8p+2"
Well, not "p+2" but "p+1"
(0x1.8 = 1.1000[2] ; *2 = 11.000[2] = 3[10]) ;
however, I get:
sprintf('%a',3)
# [1] "0x1.8p+1"
which is indeed correct.
R version 2.9.0 (2009-04-17) ## Same as yours
platform i486-pc-linux-gnu ## Different from yours ...
which perhaps suggests that there may be a mis-compilation in the
Windows version.
Ted.
I read through the help ?sprintf and didn't find anything
that changed
my expectation. What am I misunderstanding? I am using
R-2.9.0 binary
from CRAN on Windows XP Pro, and my session info is
sessionInfo()
R version 2.9.0 (2009-04-17) i386-pc-mingw32 locale: LC_COLLATE=English_United States.1252;LC_CTYPE=English_United States.1252;LC_MONETARY=English_United States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252 attached base packages: [1] stats graphics grDevices utils datasets
methods base
Thanks for any enlightenment.
Thanks Ted! Enlightenment is what I asked for, and it is what I got. I was having a senior moment I guess. I was picturing 8 as binary 0100, when obviously it is binary 1000. So yes, the required power of 2 is 1, and it is fine with me that Windows implementation does not display it. Thanks again. Dan Daniel Nordlund Bothell, WA USA
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EI-JI Nakama <nakama (a) ki.rim.or.jp> "\u4e2d\u9593\u6804\u6cbb" <nakama (a) ki.rim.or.jp>