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@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?

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