> On Sep 8, 2017, at 4:55 PM, Axel Urbiz <axel.ur...@gmail.com> wrote:
>
> Dear list,
>
> For a reason it would take me long to explain, I need to do something along
> the lines of what's shown below -- i.e., create an object from
> dplyr::summarise, and then evaluate it on a data frame.
>
> I know I could directly do:
>
> df %>% dplyr::summarise(x1_mean = mean(x1))
>
> but this is not what I'm looking for.
>
>
> library(dplyr)
>
> df <- data.frame(x1 = rnorm(100), x2 = rnorm(100))
>
> foo <- function(df) {
>
> mySummary <- quote(dplyr::summarise(x1_mean = mean(x1)))
>
> df %>% eval(mySummary)
>
> }
>
> foo(df)
>
> Error in eval(., mySummary) : invalid 'envir' argument of type 'language'
You might get a more informative error message if you didn't use `df` as your
local variable. It's the name of a function.
--
David.
>
> Thank you,
> Axel.
>
> [[alternative HTML version deleted]]
>
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David Winsemius
Alameda, CA, USA
'Any technology distinguishable from magic is insufficiently advanced.'
-Gehm's Corollary to Clarke's Third Law
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