Hi Greg, Others on this list are much more knowledgeable than I am, and I'm sure they will correct me if I'm wrong.
My understanding is that R uses double precision (see http://en.wikipedia.org/wiki/Double_precision_floating-point_format), which has the following implication: > x <- c(1,2,3)/10^308 > x*10^308 [1] 1 2 3 > x <- c(1,2,3)/10^309 > x*10^309 [1] NaN NaN NaN among others. See RSiteSearch("floating point") for other additional implications. I think you're out of luck it you need to work with values smaller than 1*10^308. -Ista On Fri, Oct 30, 2009 at 5:04 PM, Greg Michaelson <gmichael...@me.com> wrote: > I would like to increase the precision/accuracy of R. That is, I'm dealing > with numbers exceedingly close to 1, and I would like to increase the number > of significant digits used in computation. In matlab, you can use vpa() to > accomplish this. I'm wondering if there's an equivalent or a workaround in > R. > > Greg > > ______________________________________________ > 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. > -- Ista Zahn Graduate student University of Rochester Department of Clinical and Social Psychology http://yourpsyche.org ______________________________________________ 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.
