如何计算R中的组合和排列？ [英] How to calculate combination and permutation in R?

问题描述

我刚刚开始学习Probability，并且我正在寻找在Linux上可以使用的工具。

I just started to learn Probability, and I'm looking for tools to work with on linux.

我找到了一些组合包http://rss.acs.unt.edu/Rdoc/library/Combinations/html/00Index.html，但当我尝试安装它们时，该过程失败，并显示以下消息：

I've found some Combinations packages http://rss.acs.unt.edu/Rdoc/library/Combinations/html/00Index.html but when I tried to install them, the process failled with the following message:

> install.packages("Combinations")
Installing package(s) into ‘/home/maxim/R/x86_64-pc-linux-gnu-library/2.13’
(as ‘lib’ is unspecified)
Warning message:
In getDependencies(pkgs, dependencies, available, lib) :
  package ‘Combinations’ is not available (for R version 2.13.1)

推荐答案

您可以使用 combinat 包R 2.13：

You can use the combinat package with R 2.13:

install.packages("combinat")
require(combinat)
permn(3)
combn(3, 2)

如果您想知道组合数/ permutations，然后检查结果的大小，例如：

If you want to know the number of combination/permutations, then check the size of the result, e.g.:

length(permn(3))
dim(combn(3,2))[2]

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