Yeah I knew that before in the days that I made c programs but it been
so long that I forgot.
On May 8, 2008, at 6:57 AM, Gregory Weston wrote:
Since neither the question nor the answer is particularly Cocoa-
related, I'm following up off-list. I just wanted to make sure that
you understood that using % to scale your raw result into the range
you want messes with the uniformity of the sequence. Consider, as a
degenerate case, that you had a random number generator that gave
you back a number from 0 to 15 and you wanted a number between 0 and
11. If you did RND % 12, 0-3 will show up twice as often as any
other result. The closer the range of the random function is to an
integer multiple of the range you actually want, the less absolute
impact that has but there will almost always be some skewing
introduced. To alleviate that, you want to scale the raw result to a
number in [0,1), multiply that by the range of your desired result
and then add your minimum.
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