I would like to remove rows from the following data frame (df) if there are
only two specific elements found in the df$ch character string (I want to
remove rows with only "0" & "D" or "0" & "d"). Alternatively, I would like
to remove rows if the first non-zero element is "D" or "d".


                                                 ch     count
1  0000000000D0000000000000000000000000000000000000 0.007368;
2  0000000000d0000000000000000000000000000000000000 0.002456;
3  000000000T00000000000000000000000000000000000000 0.007368;
4  000000000TD0000000000000000000000000000000000000 0.007368;
5  000000000T00000000000000000000000000000000000000 0.002456;
6  000000000Td0000000000000000000000000000000000000 0.002456;
7  00000000T000000000000000000000000000000000000000 0.007368;
8  00000000T0D0000000000000000000000000000000000000 0.007368;
9  00000000T000000000000000000000000000000000000000 0.002456;
10 00000000T0d0000000000000000000000000000000000000 0.002456;


I tried the following but it doesn't work if there is more than one
character per string:

>df <- df[!df$ch %in% c("0","D"),]
>df <- df[!df$ch %in% c("0","d"),]

Any help greatly appreciated,
Claudia

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