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