[R] R: question about vectors + for loop

[Maria Wolters]

Hi,

first of all: I'm not only new to R, but also to S.
I hope this is the right forum for asking the  following
very stupid questions:
a) is there a straightforward way of saying
  for all factors f in a data frame {
      any old function, e.g. max(f)
  }
b) how can you construct a new data frame d' from 
   a given data frame d which contains only rows
   with [X=="A"] (x is a factor of d)?
   I know there's an obvious way, but with 50+ columns,
   that's a wee bit tedious :) 
c) could it be possible that there's a bug in the implementation of 
    the Kolmogorov-Smirnov test? 

Thanks in advance for your help,

Maria Wolters
wolters at ikp.uni-bonn.de
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