R Language Data operation apply series

1 ################## #R语言中apply类型问题2Data<-data.frame (X=c (1,2,3,4), Y=c (2,3,4,5), Z=c (5,6,7,8))3Apply (Data,2,mean)##apply针对数据框4Lapply (Data,mean)##lapply针对list, of course, it works for Dataframe.5Data1<-list (A=1:10,b=exp ( -3:3), c=C (false,false,false))6Lapply (Data1,mean)##list中每个变量的长度可以是不同的7Sapply (data1,mean,simplify=T)8 #In addition, there is a vapply, there is a parameter fun.value, the results of the return test, if not meet the requirements, will be an error9 #tapplyTenData2<-data.frame (X=c ("F","F","M","M","F"), Y=c (172,176,166,188,190,163)) OneTapply (data2$y,data2$x,mean,simplify=t)##分组统计的功能, simplify is true, returns as a list, FALSE returns the value directly A #aggregate function,,, subtotals - Attach (Mtcars) -Aggregate (Mtcars,by=list (cyl,gear), Fun=mean)