[R] tapply and empty subsets

[jasont@indigoindustrial.co.nz]

> I guess for my purpose the following will do.
> 
> > x <- tapply(y, z, mean)
> > x[is.na(x)] <- 0
> 
> Thanks,
> Giovanni

If I might ask, what's wrong with NA?  I occasionally deal with data sets that 
do have means close to zero, so my doing this would be misleading at best 
(YMMV).  NA is a good thing, for me.

If you just can't live with NA, na.omit(tapply(y,z,mean)) might be more 
appropriate here.

Cheers

Jason

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