R语言数据格式转换函数、数据类型判断函数（numeric、character、vector、matrix、data.frame、factor、logical）、R语言数据格式类型转换

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R语言数据格式转换函数、数据类型判断函数（numeric数值、character字符串、vector向量、matrix矩阵、data.frame数据表、factor因子、logical逻辑）、R语言数据格式类型转换

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