FAQ Topic - How do I generate a random integer from 1 to n? (2010-05-31)
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From: FAQ server on 30 May 2010 19:00 ----------------------------------------------------------------------- FAQ Topic - How do I generate a random integer from 1 to n? ----------------------------------------------------------------------- ` Math.random() ` returns a value ` R ` such that ` 0 <= R < 1.0 `; therefore: // positive integer expected function getRandomNumber(n) { return Math.floor(n * Math.random()); } - gives an evenly distributed random integer in the range from ` 0 ` to ` n - 1 ` inclusive; use ` getRandomNumber(n)+1 ` for ` 1 ` to ` n `. http://msdn.microsoft.com/en-us/library/41336409%28VS.85%29.aspx http://docs.sun.com/source/816-6408-10/math.htm How to Deal and Shuffle, see in: http://www.merlyn.demon.co.uk/js-randm.htm The complete comp.lang.javascript FAQ is at http://jibbering.com/faq/ -- The sendings of these daily posts are proficiently hosted by http://www.pair.com.
From: Dr J R Stockton on 1 Jun 2010 11:30
In comp.lang.javascript message <4c02edfb$0$279$14726298(a)news.sunsite.dk >, Sun, 30 May 2010 23:00:03, FAQ server <javascript(a)dotinternet.be> posted: >FAQ Topic - How do I generate a random integer from 1 to >How to Deal and Shuffle, see in: see via : > >http://www.merlyn.demon.co.uk/js-randm.htm That page shows that, in some browsers, the default Math.random is not as good as one might reasonably hope for. Math constants are read-only, but Math methods can be written. -- (c) John Stockton, nr London, UK. ?@merlyn.demon.co.uk Turnpike v6.05. Web <URL:http://www.merlyn.demon.co.uk/> - w. FAQish topics, links, acronyms PAS EXE etc : <URL:http://www.merlyn.demon.co.uk/programs/> - see 00index.htm Dates - miscdate.htm estrdate.htm js-dates.htm pas-time.htm critdate.htm etc. |