[R] multiple tapply

[glaporta]

Hi folk,
I tried this and it works just perfectly
tapply(iris[,1],iris[5],mean)
but, how to obtain a single table from multiple variables? 
In tapply x is an atomic object so this code doesn't work 
tapply(iris[,1:4],iris[5],mean)

Thanx and great summer holidays
Gianandrea 
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