用Mathematica统计字母、字符和单词

1、先给出字符串：

a = "If we give a paragraph of English text, we want to get the number of times each letter appears, we need to use the function: LetterCounts.This article introduces the usage of this function."

2、统计字母频率：

LetterCounts[a]

出现次数最多的是字母e。

3、出现次数最多的双字母是ti：

LetterCounts[a, 2]

4、the是出现次数最多的三字母：

LetterCounts[a, 3]

5、出现次数最多的字符是空格：

CharacterCounts[a]

6、出现次数最多的双字符是"e "：

Reverse[Sort@CharacterCounts[a, 2]]

7、出现次数最多的单词是we、of、the：

Reverse[Sort@WordCounts[a]]