[关键字]: do not use aggregate [出处]: http://www.r-bloggers.com/dont-use-statsaggregate/ [重点摘要]: Most base R code has problems if there are extra attributes on a numeric array. So R-stat code tends to have a habit of dropping attributes when it can. it is odd that the class() is kept (which itself an attribute style structure) and the timezone is lost, but R is full of hand-specified corner cases. 所以aggregate会把其他多於的attributes丢掉... 很多事情又要重来一次，例如date的格式之类的 总之，此篇作者非常不推荐aggregate 建议大家爱惜自己生命，使用dplyr XDD --

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