对嵌套列表中的列表进行排序 [英] Sorting lists inside nested lists

问题描述

我有一个嵌套列表:{{9, 8, 7}, {8, 7, 6}, {7, 6, 5}, {6, 5, 4}, {5, 4, 3}, {4, 3, 2}, {3, 2, 1}}

我需要对列表中的列表进行排序以创建:

I need to sort the lists within the list to create:

{{7, 8, 9}, {6, 7, 8}, {5, 6, 7}, {4, 5, 6}, {3, 4, 5}, {2,3, 4}, (1, 2, 3}}

我该怎么做?

推荐答案

您想要 Map 函数，将函数应用于列表的每个元素.

You want the Map function, which applies a function to each element of a list.

即Map[f, {1, 2, 3}] 给出{f[1], f[2], f[3]}.

在这种情况下，您可以使用 Map[Sort, list].Map 还有一个中缀操作符，/@:

In this case, you can use Map[Sort, list]. Map also has an infix operator, /@:

In[1]:= Map[Sort, {{9, 8, 7}, {8, 7, 6}, {7, 6, 5}, {6, 5, 4}, 
  {5, 4, 3}, {4, 3, 2}, {3, 2, 1}}]

Out[1]= {{7, 8, 9}, {6, 7, 8}, {5, 6, 7}, {4, 5, 6},
  {3, 4, 5}, {2, 3, 4}, {1, 2, 3}}

In[2]:= Sort /@ {{9, 8, 7}, {8, 7, 6}, {7, 6, 5}, {6, 5, 4}, 
  {5, 4, 3}, {4, 3, 2}, {3, 2, 1}}

Out[2]= {{7, 8, 9}, {6, 7, 8}, {5, 6, 7}, {4, 5, 6}, 
  {3, 4, 5}, {2, 3, 4}, {1, 2, 3}}

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