Try this:
> s <- c("df.example$a > 7", "df.example$b < 4")
> sapply(s, function(x) eval(parse(text = x)))
df.example$a > 7 df.example$b < 4
[1,] FALSE TRUE
[2,] FALSE TRUE
[3,] FALSE FALSE
[4,] FALSE FALSE
[5,] FALSE FALSE
[6,] FALSE FALSE
[7,] FALSE TRUE
[8,] TRUE FALSE
[9,] TRUE FALSE
[10,] TRUE TRUE
On Thu, Jul 16, 2009 at 4:44 PM, Erik Iverson<eiver...@nmdp.org> wrote:
> Dear R-help,
>
> I am having quite a difficult time coming up with what I want to do involving
> named lists.
>
> I have a list of logical expressions, and I would really like it if the
> "names" of the components of the list were identical to the corresponding
> logical expression.
>
> So, as an example:
>
> df.example <- data.frame(a = 1:10, b = rnorm(10, 5))
>
> list.example <- list(df.example$a > 7,
> df.example$b < 4)
>
> Now what I'd really like is to name the components, and get the results of
> the following line without having to specify the right-hand side individually
> for each component:
>
> names(list.example) <- c("df.example$a > 7", "df.example$b < 4")
>
>
> Any ideas?
>
> Best Regards,
> Erik Iverson
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
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