语法toupper()和 tolower()函数的基本语法为: toupper(x) tolower(x)
以下是所使用的参数的说明: 示例# Changing to Upper case. result <- toupper("Changing To Upper") print(result) # Changing to lower case. result <- tolower("Changing To Lower") print(result)
当我们上面的代码执行时,它产生以下结果: [1] "CHANGING TO UPPER" [1] "changing to lower"
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