bigmouse </p> <p>> data(dietox)<br /> > dx<-subset(dietox,Time==12)<br /> > summaryBy(Weight+Feed~Evit+Cu,data=dx,FUN=c(mean,var,length))<br /> 报错: Error in FUN(X[[1L]], ...) : could not find function "currFUN"</p> 求问怎么解决?