On Tue, Feb 01, 2011 at 12:51:18PM -0800, Kiogou Lydie wrote: > > > PLEASE HELP > > I actually want to do the following: > > a[j] = (1/(j!))*?? (i-1-d), j = 500, ?? means product i = 1 to > j > > ?? > > Yet, j! will stop at 170 and ?? (i-1-d) at 172; so, a[j] will > not exceed 170. > > I would like to have at least 200 a[j]. > > ?? > > WHAT SHOULD I DO?
Computing factorial of 171 and larger numbers may be done using extended arithmetic in Rmpfr as already suggested. Depending on the purpose of computing factorial of large numbers, consider also the function lfactorial(), which computes the logarithm in the standard numeric type. lfactorial(1000) [1] 5912.128 Hope this helps. Petr Savicky. ______________________________________________ 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.
