Bugs item #1707940, was opened at 2007-04-26 09:53 Message generated for change (Tracker Item Submitted) made by Item Submitter You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=107586&aid=1707940&group_i... Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: random Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: Jeffrey Brent McBeth (mcbeth) Assigned to: Jens Maurer (jmaurer) Summary: random::normal_distribution Initial Comment: random::normal_distribution always returns a NaN when presented with a UniformRandomNumberGenerator that provides values outside the range of (0,1). So, for example, this will print a NaN. #include <boost/random.hpp> #include <iostream> int main(int argc, char *argv[]) { boost::mt19937 eng(40); boost::normal_distribution<> norm(0,1); std::cout << norm(eng) << std::endl; } Looking at the code, it is clear that for normal_distribution's answers to be defined, the values need to be in the range (0,1) The attached patch uses uniform_real to restrict the range to [0,1). Unfortunately, this leaves 0 as a fail point. I don't see a clear way to fix that at the moment. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=107586&aid=1707940&group_i... ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Boost-bugs mailing list Boost-bugs@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/boost-bugs