Hi,

maybe someone can help me with this:

I have a matrix of genes and values:
GeneName   Value
Abc1               10  
Abc2               11           
Bbc1                -5  
Bbc31               2
Ccd                   5
Ccd                  -2
Ccd                   7
Dda                   5
Dda                  10
.....                    .....  
Zzz3                  -1

I would like to create a new matrix where the GeneNames which are 
duplicated and do not have the absolut maximum value between these 
duplicated genes, are deleted; i.e.

GeneName   Value
Abc1               10  
Abc2               11           
Bbc1                -5  
Bbc31               2
Ccd                   7
Dda                  10
.....                    .....  
Zzz3                  -1

Does anyone know if there is a function that works this way in R? How 
would you do it?
Thank you very much in advance!

Cheers

Paul


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