Aliases: aveWithArgs
Keywords:
### ** Examples aveWithArgs(1:10,rep(1:5,2))
[1] 3.5 4.5 5.5 6.5 7.5 3.5 4.5 5.5 6.5 7.5
aveWithArgs(c(1:9,NA),rep(1:5,2),max,na.rm=TRUE)
[1] 6 7 8 9 5 6 7 8 9 5