[R] Remove specific rows in a matrix/data.frame

[syrvn]

Hi,


imagine the following matrix/data.frame

Letter Number
a 1
a 1
b 1
b 0
c 0
c 1
d 0
d 0 

If the numbers for two identical letters are also identical then I want to
remove either the first or the
second row of that letter. If for a letter the numbers are 1 and 0 I want to
remove the row with the 0.

That means if the code works I would and up with the following
matrix/data.frame

Letter Number
a 1
b 1
c 1
d 1


Many thanks,
Syrvn


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