Path: news.mathworks.com!not-for-mail From: "John D'Errico" <woodchips@rochester.rr.com> Newsgroups: comp.soft-sys.matlab Subject: Re: Weighted random number generator Date: Tue, 22 Jul 2008 09:53:01 +0000 (UTC) Organization: John D'Errico (1-3LEW5R) Lines: 30 Message-ID: <g64alt$1kr$1@fred.mathworks.com> References: <g647ip$2d5$1@fred.mathworks.com> Reply-To: "John D'Errico" <woodchips@rochester.rr.com> NNTP-Posting-Host: webapp-03-blr.mathworks.com Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 8bit X-Trace: fred.mathworks.com 1216720381 1691 172.30.248.38 (22 Jul 2008 09:53:01 GMT) X-Complaints-To: news@mathworks.com NNTP-Posting-Date: Tue, 22 Jul 2008 09:53:01 +0000 (UTC) X-Newsreader: MATLAB Central Newsreader 869215 Xref: news.mathworks.com comp.soft-sys.matlab:480865 "stinkinrich88 Coombez" <stinkinrich88@gmail.com> wrote in message <g647ip$2d5$1@fred.mathworks.com>... > Hello, > > I would like a function similar to the rnd function but I > want the generated numbers to be weighted, i.e. I would like > the function to be more likely to give me a higher number > than a lower number and I would like to be able to specify > this probability. > > For example, the betarnd function almost does what I want. I > can make a sloping probability distribution with it. The > only trouble is the probability distribution bulges slightly > in the middle and I want it to be straight. > > Is there any function I can use to do this? Or a function > that gives me random numbers (between 0-1) using a formula > that I specify? > > Thanks! While you can indeed generate your own random generator for a linear pdf, it is also trivial to use the stats toolbox and the beta distribution. You just need to choose the proper set of parameters. ezplot(@(x) betapdf(x,2,1),[0 1]) John