On Thu, May 26, 2011 at 9:15 PM, Dave Keck <davek...@gmail.com> wrote: >> I'm using random(), but every time I run my app I get the same sequence, >> despite having this code in my app delegate's -appDidFinishLaunching method. >> Clearly I'm not seeding it right, though I can't see why - I get a different >> value for seed every time. What gives? >> >> >> unsigned seed = (unsigned)([NSDate timeIntervalSinceReferenceDate] * >> 10000.0); >> >> NSLog(@"launched, seed = %ld", seed ); >> srandom( seed ); > > I'm not sure what your problem is, but I believe arc4random() has > superseded random() for a while now. Be careful with ARC4 since its output is biased. The bias makes it unsuitable for cryptographic/security related uses; and probably unsuitable for other purposes, such as simulations, where a unifirm distribution is usually needed.
Jeff _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
