[R-sig-Finance] How to get values from dataframe's column conditional on other column

[Gabor Grothendieck]

If DF is your data.frame

with(DF, X[Y])

or

DF$X[DF$Y]



On 6/13/06, Yuri Volchik <volchik2000 at list.ru> wrote:
> Hi to all members of this list,
>
> I'm quite a novice to R and was wondering if there is a more elegant
> way to solve a following problem:
> Suppose we have a dataframe
>  X     Y
> .12   TRUE
> -.24  TRUE
> ..     ...
> .34   FALSE
>
> i.e. two (or more columns) with data and we want to get vector of X
> values conditional on Y values (say only X's when Y=TRUE).
> Of course it is possible to do it by looping through the whole
> dataframe, i was wondering if there is a a more elegant solution to
> this in R?
>
> --
> Best regards,
>  Yuri                            mailto:volchik2000 at list.ru
>
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