convert large integers to hex
There is an interface between R and bc -- not on CRAN but available from its home page here: http://r-bc.googlecode.com
source("http://r-bc.googlecode.com/svn/trunk/R/bc.R")
bc("obase = 16; 123456789123456789", retclass = "character")
[1] "1B69B4BACD05F15"
On Wed, May 6, 2009 at 9:59 PM, jim holtman <jholtman at gmail.com> wrote:
You can use the 'bc' command (use Cygwin if on Windows); /cygdrive/c: bc bc 1.06 Copyright 1991-1994, 1997, 1998, 2000 Free Software Foundation, Inc. This is free software with ABSOLUTELY NO WARRANTY. For details type `warranty'. x=6595137340052185552 obase=16 x 5B86A277DEB9A1D0 You can call this from R. On Wed, May 6, 2009 at 3:26 PM, Sundar Dorai-Raj <sdorairaj at gmail.com>wrote:
Hi, I'm wondering if someone has solved the problem of converting very large integers to hex. I know about format.hexmode and as.hexmode, but these rely on integers. The numbers I'm working with are overflowing and losing precision. Here's an example: x <- "6595137340052185552" # stored as character as.integer(x) # warning about inaccurate conversion format.hexmode(as.numeric(x)) # warnings about loss of precision as.hexmode(x) # more warnings and does not do what I expected I'm planning on writing a function that will do this, but would like to know if anybody already has a solution. Basically, I would like the functionality of format.hexmode on arbitrarily large integers. Thanks, --sundar
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______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.