[R] if else statements in data frame

[ozgrerg]

Dear R experts, I have again a problem. Let I have a data frame like below:

x	y
----------
A	A
A	B
B	B
A	B

where x and y are the column names. I want to create a new column z where it
is elements
will be like that, if at each row has there at least one 'B', then z will
have value of B, if not then Z will
have missing value(NA) for the corresponding row. So my result data frame
should be like below:

x	y	Z
------------------
A	A	NA
A	B	B
B	B	B
A	B	B

How can I do this with if else statements in R. Thanks a lot.   


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