Re: Random number generator -- OS X different
Re: Random number generator -- OS X different
- Subject: Re: Random number generator -- OS X different
- From: Daniel Robinson <email@hidden>
- Date: Sat, 21 Apr 2001 00:02:05 -0400
Good Evening,
It was brought to my attention by Bill Fancher that when run on OS X,
Script A, posted yesterday, gave skewed results.
After stepping through, I find that the error occurred when OS X rounded
the results to a an integer. In Script B, adding 0.5 to the result
solves the problem.
Regards
--Dan
------------------------------ SCRIPT A
-------------------------------------------
set TheList to {0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
set N to the count of items in TheList
repeat 1000 times
random number N - 1
set ThisNumber to the result + 1
set item ThisNumber of TheList to (item ThisNumber of TheList) + 1
end repeat
TheList
--> {1524, 1000, 1017, 1015, 1014, 1026, 977, 930, 1006, 491}
--------------------------------- SCRIPT B
---------------------------------------
set TheList to {0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
repeat 100000 times
random number
set ThisNumber to {(the result + 0.05) * 10} as integer
set item ThisNumber of TheList to (item ThisNumber of TheList) + 1
end repeat
TheList
--> {10018, 10107, 10126, 9911, 10072, 10084, 10208, 9843, 9892, 9739}
bill fancher wrote:
>
On Friday, April 20, 2001, at 04:41 AM, Daniel Robinson wrote:
>
>
> Are you using Applescript before 1.6?
>
>
1.6 on Mac OS X. I tried it a few more times with n=10000. This was
>
typical:
>
>
{1524, 1000, 1017, 1015, 1014, 1026, 977, 930, 1006, 491}
>
>
--
>
bill