code logs -> 2008 -> Tue, 01 Jan 2008< code.20071231.log - code.20080102.log >
--- Log opened Tue Jan 01 00:00:06 2008
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02:55 * AnnoDomini will be going to sleep soon.
02:55
<@AnnoDomini>
But first, a problem that's beyond me.
02:57
<@AnnoDomini>
Given a roll of N six-sided dice, where the highest result counts and every die that came up as 6 adds 1 to the final result (no floating reroll), one wants to achieve at least number M.
02:58
<@AnnoDomini>
So a roll of 4 dice, falling 1, 4, 6, 6 would result in 8.
02:58
<@AnnoDomini>
How can one calculate the probability of achieving at least number M with N dice?
02:58 * AnnoDomini sleeps.
02:59
< Finerty>
for any roll, it's max(rolls) + count(rolls, 6)
03:00
< Finerty>
there's only 60M things for 10d6.
03:02
< Finerty>
...even then it's not that hard, let's see.
03:06
< Finerty>
at least 2 to at least 6 is 1 - ((M-1)/6)**N
03:08
< Finerty>
At least 7 on up is a bit harder... hmmm...
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03:45
< Finerty>
To get exactly, it's (M-6) choose N * 5**(M+N-6)
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19:40
< Vornicus>
Arg. CONCENTRATE
19:41 * AnnoDomini starts cooking bacon in front of Vornicus.
19:41
< Vornicus>
baaaacoooon
19:45
<@EvilDarkLord>
You're getting enough sleep, right Vorn?
19:45
< Vornicus>
Yes.
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21:11
<@AnnoDomini>
Hrm. Anyone know what 'function maximalization' might mean in context of using genetic algorithms to achieve it?
21:18
<@McM[SanDiego]>
You have some function f(x)
21:18 You're now known as TheWatcher
21:18
<@AnnoDomini>
Yeah.
21:18
<@McM[SanDiego]>
You want to find an x such that f(x) is the largest valus possible.
21:18
<@McM[SanDiego]>
So, for f(x) = 3-x^2, for instance, you want it to find 0.
21:18
<@McM[SanDiego]>
value, not valus
21:19
<@AnnoDomini>
Oh... so I find the argument value which are subjected to a specific function and try to find when the result is highest?
21:20
<@McM[SanDiego]>
Yes. Gets more interesting when the function has local maxima that are not the best (think a complicated polynomial) or if there are lots of variables so that the search space is enormous.
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--- Log closed Wed Jan 02 00:00:12 2008
code logs -> 2008 -> Tue, 01 Jan 2008< code.20071231.log - code.20080102.log >