Dear R Group
I have a matrix object in R, where i want to retain only those columns 
which have each row from a different group..

see the example below..
team1<-c("a1","a2","b1","b2","b3","c1","c2")

teams<-combn(team1, 3)

I want a function which will delete all columns in the teams matrix that 
have more than 1 row having same letter starts..

For instance in the example object teams,  I want to retain column 
8,11,12,13,14,18,19,21,22,23,24 .
I am looking at doing this in larger matrix objects using a function 
preferrably that i can apply to the matrix object to check for the 
beginning letter of each cell from each row and delete columns that have 
more than one row having the same start letter.

Thanks for your help.
Regards
Vijayan Padmanabhan


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