R help - Apr 2009 - Obtaining average ranking from matrix of frequencies

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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say 'm' is your matrix, then try

rowMeans(m * col(m))


I hope it helps.

Best,
Dimitris


bwgoudey wrote:
> 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
> 
> 
> 
> 
-- 
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center

Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
Tel: +31/(0)10/7043478
Fax: +31/(0)10/7043014