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 <jholt...@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 <sdorai...@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 >> >> ______________________________________________ >> R-help@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<http://www.r-project.org/posting-guide.html> >> and provide commented, minimal, self-contained, reproducible code. >> > > > > -- > Jim Holtman > Cincinnati, OH > +1 513 646 9390 > > What is the problem that you are trying to solve? > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@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. > ______________________________________________ R-help@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.