Re: Balancing randomness
This WebDNA talk-list message is from 2000
It keeps the original formatting.
numero = 27979
interpreted = N
texte = On 2/23/00 4:26 pm, Christer Olsson so noted...>I belive your first results are based on a bad formula: > >[math]pick=[format .0f][math]pick=(([random]/100)*4)+1[/math][/format][/math] > >The part [random]/100)*4)+1 does not do what I think you expect it to do. > >If [random] is from 1-12 (12 figures) your formula will result in 1 >If [random] is from 13-37 (25 figures) your formula will result in 2 >If [random] is from 38-61 (24 figures) your formula will result in 3 >If [random] is from 62-87 (26 figures) your formula will result in 4 >If [random] is from 88-100 (13 figures) your formula will result in 5Excellent call. I had been using [format .0f] as an integer function, which is wrong since [format] is rounding up, not just lopping off the decimal (resulting in the quantities of the end numbers being skewed -- 1 would hit 13 times, 5 would hit 12, the rest at 25).By changing the formula to use floor( )...[math]pick=floor(([random]/100)*5)+1[/math] On my loop of 1000, I get a *far* better distribution:1 = 190 (19%) 2 = 202 (20.2%) 3 = 199 (19.9%) 4 = 207 (20.7%) 5 = 202 (20.2%)Whoo hoo!Now to look through a few websites and find where else I've used my crappy random routine : )P.S. [random] on Mac WC 3.0.5b11 gives numbers from 0-99 -- should I be concerned?Rob Marquardt Designer/Resident Wirehead Toast Design800 Washington Avenue North Minneapolis MN 55401 612.330.9863 v 612.321.9424 f www.toastdesign.com ------------------------------------------------------------- Brought to you by CommuniGate Pro - The Buzz Word Compliant Messaging Server. To end your Mail problems go to
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On 2/23/00 4:26 pm, Christer Olsson so noted...>I belive your first results are based on a bad formula: > >[math]pick=[format .0f][math]pick=(([random]/100)*4)+1[/math][/format][/math] > >The part [random]/100)*4)+1 does not do what I think you expect it to do. > >If [random] is from 1-12 (12 figures) your formula will result in 1 >If [random] is from 13-37 (25 figures) your formula will result in 2 >If [random] is from 38-61 (24 figures) your formula will result in 3 >If [random] is from 62-87 (26 figures) your formula will result in 4 >If [random] is from 88-100 (13 figures) your formula will result in 5Excellent call. I had been using [format .0f] as an integer function, which is wrong since [format] is rounding up, not just lopping off the decimal (resulting in the quantities of the end numbers being skewed -- 1 would hit 13 times, 5 would hit 12, the rest at 25).By changing the formula to use floor( )...[math]pick=floor(([random]/100)*5)+1[/math] On my loop of 1000, I get a *far* better distribution:1 = 190 (19%) 2 = 202 (20.2%) 3 = 199 (19.9%) 4 = 207 (20.7%) 5 = 202 (20.2%)Whoo hoo!Now to look through a few websites and find where else I've used my crappy random routine : )P.S. [random] on Mac WC 3.0.5b11 gives numbers from 0-99 -- should I be concerned?Rob Marquardt Designer/Resident Wirehead Toast Design800 Washington Avenue North Minneapolis MN 55401 612.330.9863 v 612.321.9424 f www.toastdesign.com ------------------------------------------------------------- Brought to you by CommuniGate Pro - The Buzz Word Compliant Messaging Server. To end your Mail problems go to .This message is sent to you because you are subscribed to the mailing list . To unsubscribe, E-mail to: To switch to the DIGEST mode, E-mail to
Rob Marquardt
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