[R] convert large integers to hex
ggrothendieck at gmail.com
Thu May 7 14:10:53 CEST 2009
There is an interface between R and bc -- not on CRAN but available
from its home page here:
> bc("obase = 16; 123456789123456789", retclass = "character")
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'.
> You can call this from R.
> On Wed, May 6, 2009 at 3:26 PM, Sundar Dorai-Raj <sdorairaj at gmail.com>wrote:
>> 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.
>> R-help at r-project.org mailing list
>> PLEASE do read the posting guide
>> 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 at r-project.org mailing list
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
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