[R] Inconsistency among mean, median, max, var

[ggrothendieck@yifan.net]

I found a strange inconsistency:

If m is a matrix and d is a data frame then

- mean(m), median(m), max(m) and max(d) all return a single value 

but

- mean(d) returns the column means 
- median(d) fails
- both var(m) and var(d)  return the variance covariance matrix

You pretty much have to experiment to figure this out since much of this 
behavior is not readily obvious from the help files.

Even after you have figured it out, its pretty hard to remember.

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