你能帮我解决一下如何在R中正确使用聚合函数吗？我有这样的数据:
SPORT FLOWS
[1,] "Other" "1"
[2,] "Other" "1"
[3,] "Other" "1"
[4,] "Other" "1"
[5,] "Other2" "1"
[6,] "Other2" "1"
我需要得到这个:
SPORT FLOWS
[1,] "Other" "4"
[2,] "Other2" "2"
我发现,它可以用聚合函数完成,但它不起作用..
谢谢你们..我有明确的回答,对我有用..