The following packages support high precision precision arithmetic (and the last two also support exact arithmetic):
bc - interface to bc calculator http://r-bc.googlecode.com gmp - interface to gmp (gnu multiple precision) http://cran.r-project.org/web/packages/gmp rSymPy - interface to sympy computer algebra system http://rsympy.googlecode.com Ryacas - interface to yacas computer algebra system http://ryacas.googlecode.com On Fri, May 8, 2009 at 4:54 PM, joaks1 <joa...@gmail.com> wrote: > > I need to perform some calculations with some extremely small numbers (i.e. > likelihood values on the order of 1.0E-16,000). Even when using the > double() function, R is rounding these values to zero. Is there any way to > get R to deal with such small numbers? > > For example, I would like to be able to calculate e^-10000 (i.e. > exp(-10000)) without the result being rounded to zero. > > I know I can do it in Mathematica, but I would prefer to use R if I can. > Any help would be appreciated! > > Many Thanks in Advance! > -- > View this message in context: > http://www.nabble.com/Beyond-double-precision--tp23452471p23452471.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > 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.
