r语言 distinct()
时间: 2023-10-19 08:56:37 浏览: 187
回答: 在R语言中,distinct()函数用于计算数据框中某一列的独特值数量。例如,使用n_distinct(df$team)可以计算数据框df中"team"列的独特值数量,结果为2。\[1\] 另外,使用sapply(df, function(x) n_distinct(x))可以计算数据框中每一列的独特值数量,结果为"team"列有2个独特值,"points"列有5个独特值,"assists"列有6个独特值。\[1\] 如果想要按照某一列进行分组计算独特值数量,可以使用dplyr包中的group_by()和summarize()函数。例如,使用df %>% group_by(team) %>% summarize(distinct_points = n_distinct(points))可以计算按照"team"列分组后,"points"列的独特值数量,结果为"A"组有3个独特值,"B"组有2个独特值。\[1\] \[2\]
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