Hello,
I have a column with a bunch of letters. I would like to keep some of these
letters (A,C,D,L) and turn the rest into 'X'.
I have tried using ifelse with '|' in between the argument but it didn't work
nor did 4 separate ifelse statements.
Example, I currently have:
Letters A B C D E
I would like to have:
Letters A X C D X
Thank you
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