Hi,
I have a dataframe with 43 columns and a 1000 rows.  Each entry in the
dataframe can be either P or A.
here is a small chunk:
         c1    c2 ...    c43
r100  P     A   ...      P
r101  A     A   ...      A
r102  P     P   ...      P

How does one subset this data frame to select those rows that have only P's
in them?

Thanks in advance.
Anjan




-- 
===================================
anjan purkayastha, phd.
research associate
fas center for systems biology,
harvard university
52 oxford street
cambridge ma 02138
phone-703.740.6939
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