On Tue, 13 Oct 2009, AJ83 wrote:
I need to create a function to find all the prime numbers in an array. Can anyone point me in the right direction?
It depends a bit on how big the numbers are. If the array is large but the numbers are not very large the fastest approach is probably to create a vector of small primes and use
my_array %in% smallprimes. For example, the first 1000 primes are at http://primes.utm.edu/lists/small/1000.txt and the first 10000 are on the same site. -thomas Thomas Lumley Assoc. Professor, Biostatistics tlum...@u.washington.edu University of Washington, Seattle ______________________________________________ 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.
