[R] Obtaining average ranking from matrix of frequencies

[bwgoudey]

I have a small matrix where the columns represents a ranking and the values
are the number of times each ranking was obtained eg 

     1  2  3
x   1  2  0
y   0  1  2
z   2  0  1

I'd like to be able to return an average of the ranking obtained
   average
x  1.67
y  2.67
z  1.67

Whats the nicest way to do this? I'm new to the language and looking for an
elegant solution :)

Thanks
  Ben




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