Passing strings as arguments in dplyr verbs

Question

I would like to be able to define arguments for dplyr verbs

condition <- \"dist > 50\"

and then use these strings in

Answer 1

While they're working on that, here is a workaround using if:

library(dplyr)
library(magrittr)

ds <- data.frame(attend = c(1:5,NA,7:9,NA,NA,12))

filter_na <- FALSE

filtertest <- function(x,filterTF = filter_na){
  if(filterTF) x else !(x)
}

ds %>%
  filter(attend %>% is.na %>% filtertest)

  attend
1      1
2      2
3      3
4      4
5      5
6      7
7      8
8      9
9     12

filter_na <- TRUE
ds %>%
  filter(attend %>% is.na %>% filtertest)

  attend
1     NA
2     NA
3     NA