[R] multiple tapply

[Gabor Grothendieck]

Here are three ways:

# 1
aggregate(iris[-5], iris[5], mean)

# 2
library(doBy)
summaryBy(.~Species, iris, keep = TRUE)

# 3
library(sqldf)
sqldf("select Species,
   avg(Sepal_Length) Sepal_Length,
   avg(Sepal_Width) Sepal_Width,
   avg(Petal_Length) Petal_Length,
   avg(Petal_Width) Petal_Width
from iris
group by Species")


On Thu, Aug 7, 2008 at 7:01 AM, glaporta <glaporta at freeweb.org> wrote:
>
> 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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