[R] tapply, how to get level information

[Antje]

Hello,

I'm applying a self-written function to a matrix on basis of different 
levels.
Is there any way, to get the level information within the self-written 
function???

t <- tapply(mat, levels, plotDensity)

plotDensity <- function(x) {
	??? print(level(x)) ???
}

Antje