[R] Dataframe and conditions

[fgrelier]

I have in a dataframe X  :  3 Variables X$a , X$b, X$c
I would like to replace in X the values of X$a by the values of  X$c but
only when X$b=="TRUE"
I have tried to put in place a loop but as I have a lot of rows it is very
very long to run.

Thanks for your help





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