No it isn't strange. Please read: ?options digits ?print.default
and then print the results with more digits. Bert Gunter Genentech Nonclinical Biostatistics -----Original Message----- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of Len Vir Sent: Thursday, January 28, 2010 4:17 PM To: R-help@r-project.org Subject: Re: [R] Large integers in R Hi! That is somewhat strange. B'R>2^100 [1] 1.267651e+30 B'R> x <- 2^50 B'R> y <- x + 1 B'R> y-x [1] 1 B'R>x [1] 1.1259e+15 B'R>x+1 [1] 1.1259e+15 len From: Duncan Murdoch [murd...@stats.uwo.ca] Sent: Tuesday, January 26, 2010 4:09 PM To: Blanford, Glenn Cc: r-help@R-project.org Subject: Re: [R] large integers in R On 26/01/2010 3:25 PM, Blanford, Glenn wrote: > Has there been any update on R's handling large integers greater than 10^9 (between 10^9 and 4x10^9) ? > > as.integer() in R 2.9.2 lists this as a restriction but doesnt list the actual limit or cause, nor if anyone was looking at fixing it. Integers in R are 4 byte signed integers, so the upper limit is 2^31-1. That's not likely to change soon. The double type in R can hold exact integer values up to around 2^52. So for example calculations like this work fine: > x <- 2^50 > y <- x + 1 > y-x [1] 1 Just don't ask R to put those values into a 4 byte integer, they won't fit: > as.integer(c(x,y)) [1] NA NA Warning message: NAs introduced by coercion Duncan Murdoch [[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.