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xelatex
V2EX member #528686, joined on 2021-01-17 10:59:27 +08:00
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Feb 10, 2021
Replied to a topic by
mutelog
程序员
正态分布样本最大值服从什么分布
留意到样本最大值小于某个数和所有样本小于那个数是等价的,假设独立,可以写出样本最大值的累积分布函数。这东西恐怕没有初等表示。画了两个图,可以感觉一下。
i.loli.net/2021/02/10/KoupVg8G92lRj4Y.png
i.loli.net/2021/02/10/YMbQF9PpyBxvmO2.png
Jan 26, 2021
Replied to a topic by
flowfire
程序员
一个生成打乱的魔方的算法应该怎么写呢(正文里有详情)
可以。三阶魔方拆散拼回去有 1/12 可能是可以还原的。判断不难,能心算:角块色向和是零( 1/3 )、边块色向和是零( 1/2 )、角边置换同奇偶( 1/2 )。要生成也容易,取随机置换,之后取固定两角修理好奇偶、取一边修理好边色向和、取一角修理好角色向和,即可确保能还原。
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