matlab函数perms：排列产生函数

perms

产生所有可能的排列

语法

P = perms(v)

P =perms(v)，这里v是一个长度为n的行向量，此函数产生v中这n个元素的全排列矩阵，每行为一个排列。矩阵P包含有n！行和n列。

举例

命令perms(2:2:6) 返回数字2、4和6的所有排列：
 

   6    4    2
    6    2    4
    4    6    2
    4    2    6
    2    4    6
    2    6    4

局限

此函数值只能适用于n < 15的情况下。

相关函数

nchoosek, permute, randperm

【jink2005译】

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perms

All possible permutations

Syntax

P = perms(v)

P = perms(v), where v is a row vector of length n, creates a matrixwhose rows consist of all possible permutations of the n elementsof v. Matrix P contains n! rows and n columns.

Examples

The command perms(2:2:6) returns all the permutations of thenumbers 2, 4, and 6:  
    6    4    2
    6    2    4
    4    6    2
    4    2    6
    2    4    6
    2    6    4

Limitations

This function is only practical for situations where n is less thanabout 15.

See Also

nchoosek, permute, randperm



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