R/s_dplyr.r

In skranz/XEconDB: Experimental Economics Database

# Helper functions that allow string arguments for dplyr's data modification functions like arrange, select etc.
# Author: Sebastian Kranz
 
# Examples are below
 
#' Modified version of dplyr's filter that uses string arguments
#' @export
s_filter = function(.data, ...) {
eval.string.dplyr(.data,"filter", ...)
}
 
#' Modified version of dplyr's select that uses string arguments
#' @export
s_select = function(.data, ...) {
eval.string.dplyr(.data,"select", ...)
}
 
#' Modified version of dplyr's arrange that uses string arguments
#' @export
s_arrange = function(.data, ...) {
eval.string.dplyr(.data,"arrange", ...)
}
 
#' Modified version of dplyr's arrange that uses string arguments
#' @export
s_mutate = function(.data, ...) {
eval.string.dplyr(.data,"mutate", ...)
}
 
#' Modified version of dplyr's summarise that uses string arguments
#' @export
s_summarise = function(.data, ...) {
eval.string.dplyr(.data,"summarise", ...)
}
 
#' Modified version of dplyr's group_by that uses string arguments
#' @export
s_group_by = function(.data, ...) {
eval.string.dplyr(.data,"group_by", ...)
}
 
#' Internal function used by s_filter, s_select etc.
eval.string.dplyr = function(.data, .fun.name, ...) {
  args = list(...)
  restore.point("eval.string.dplyr")
  
  args = unlist(args)
  code = paste0(.fun.name,"(.data,", paste0(args, collapse=","), ")")
  df = eval(parse(text=code,srcfile=NULL))
  df
}