[R] Dataframe and conditions

[Rui Barradas]

Hello,

Try the following.

X$a[X$b] <- X$c[X$b]


Hope this helps,

Rui Barradas

Em 14-05-2013 09:06, fgrelier escreveu:
>
> 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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