[R] tapply histogram

[livia]

Dear members,

I would like to pass the histogram settings to each subset of the dataframe,
and generate a multiple figures graph.

First, can anyone tell me how to generate a multiple figures environment? I
am trying 

mfrow=c(2,4) and nothing appears.

Secondly, I want to pass the following function in tapply()

hist(x, freq=FALSE)
lines(density(x), col="red")
rug(x)

how can I manage it?

Many thanks

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