[R] function in R that's equivalent to SQL's "IN"

[Benilton Carvalho]

z$y[z$x %in% w]

b

On Oct 26, 2007, at 4:19 PM, Em C wrote:

> Hi all,
>
> I'm trying to find
> something like the "==" operator that will work on vectors or  
> something
> equivalent to SQL's "IN" function. For e.g., if I have:
>
> x <- c(1,2,3,4,5)
> y <- c("apples", "oranges", "grapes", "bananas", "pears")
> z <- data.frame (x,y)
> w <- c(2,4,5)
>
> I want R to return the values "oranges", "bananas", "pears" through  
> some function like this:
>
> z$y[z$x == w]
>
> or in sql speak, like this
>
> z$y[z$x IN w]
>
> To complicate matters, my x variable is a date variable (as is w).  
> Essentially, I have a bunch of dates with associated values and I  
> want to retrieve all the associated values for particular dates.
>
> Is there any R function that will do this in a one-line, non-messy  
> way? Thanks very much for any help!
>
> Emily
>
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