R 合并元素
合并元素
您可以使用 paste() 函数来连接或合并两个或多个元素。
要组合文本和变量，R 使用逗号 (,)
您还可以使用 , 将一个变量添加到另一个变量
对于数字，+ 字符用作数学运算符
如果您尝试组合字符串（文本）和数字，R 会报错
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