[R] problem with conditional column sums

[JSHuang]

Hi, 

  I think you need quotation around I like the following:
> status
   2010 2011 2012
1     A    A    A
2     A    I    I
3     A    A    A
4     U    U    U
5     A    A    A
6     I    I    I
7     U    I    I
8     A    U    A
9     I    A    U
10    I    I    I
> apply(start,2,function(x) {sum(x=="I",na.rm=TRUE)})
X2010 X2011 X2012 
    3     4     4 



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