count_all: Count helper functions
In richierocks/countess: Helpers for "dplyr"'s "count" Function

Description Usage Arguments Value See Also Examples

View source: R/count.R

Variants of dplyr's count function, letting you count the instances of each value in columns of your data frame.

count_all: group_by_all + tally
count_at: group_by_at + tally
count_if: group_by_if + tally

count_all(x, wt = NULL, sort = FALSE)

count_at(x, .vars, wt = NULL, sort = FALSE)

count_if(x, .predicate, wt = NULL, sort = FALSE)

`x`	A `tbl` object.
`wt`	(Optional) If omitted (and no variable named n exists in the data), will count the number of rows. If specified, will perform a "weighted" tally by summing the (non-missing) values of variable wt. A column named n (but not nn or nnn) will be used as weighting variable by default in tally(), but not in count(). This argument is automatically quoted and later evaluated in the context of the data frame. It supports unquoting. Passed to `count`.
`sort`	Logical. Should the results be sorted by decreasing `n`.
`.vars`	A list of columns generated by vars(), a character vector of column names, a numeric vector of column positions, or NULL. Passed to `group_by_at`.
`.predicate`	A predicate function to be applied to the columns or a logical vector. The variables for which `.predicate` is or returns `TRUE` are selected. This argument is passed to `rlang::as_function()` and thus supports quosure-style lambda functions and strings representing function names. Passed to `group_by_if`.

A summarized version of x.

count and group_by_all

library(dplyr)
n <- 100
quarks <- data_frame(
  first_gen = sample(c("up", "down"), n, replace = TRUE),
  second_gen = sample(c("charm", "strange"), n, replace = TRUE),
  third_gen = factor(sample(c("top", "bottom"), n, replace = TRUE))
)
quarks %>% count_all()
quarks %>% count_at(vars(contains("ir")))
quarks %>% count_if(is.factor)