Hi all,

I have a matrix of "A"/"P" calls. I want to filter for the probes that are
present on all the replicates, for example
          sample1_1       sample1_2        sample2_1       sample2_2
gene1      A                   P                       P                  P
gene2      P                   P                      A                   P
gene3     A                   P                      A                    P
gene4     A                   A                     A
A
...

I want to select for gene1 and gene2. I guess this a computational question.
As I am new to R, could anybody give me some hints...Thank you in advance.

Wendy

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