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## ---- include = FALSE---------------------------------------------------------
knitr::opts_chunk$set(
collapse = TRUE,
comment = "#>"
)
options(
tibble.print_min = 4,
tibble.print_max = 4
)
options(
crayon.enabled = FALSE
)
## ----setup--------------------------------------------------------------------
library(tidyselect)
library(magrittr)
# For better printing
mtcars <- tibble::as_tibble(mtcars)
iris <- tibble::as_tibble(iris)
## -----------------------------------------------------------------------------
select_loc <- function(data, ...) {
eval_select(rlang::expr(c(...)), data)
}
rename_loc <- function(data, ...) {
eval_rename(rlang::expr(c(...)), data)
}
## -----------------------------------------------------------------------------
mtcars %>% select_loc(mpg:hp, !cyl, vs)
mtcars %>% select_loc(1:4, !2, 8)
## -----------------------------------------------------------------------------
mtcars %>% select_loc(2:4)
## -----------------------------------------------------------------------------
mtcars %>% select_loc(cyl:hp)
## -----------------------------------------------------------------------------
iris %>% select_loc(starts_with("Sepal") | ends_with("Width"))
## -----------------------------------------------------------------------------
iris %>% select_loc(starts_with("Sepal") & ends_with("Width"))
## -----------------------------------------------------------------------------
iris %>% select_loc(!ends_with("Width"))
## -----------------------------------------------------------------------------
iris %>% select_loc(starts_with("Sepal") & !ends_with("Width"))
## -----------------------------------------------------------------------------
mtcars %>% select_loc(mpg, disp:hp)
mtcars %>% select_loc(c(mpg, disp:hp))
## -----------------------------------------------------------------------------
iris %>% select_loc(starts_with("Sepal"), ends_with("Width"), Species)
iris %>% select_loc(starts_with("Sepal") | ends_with("Width") | Species)
## -----------------------------------------------------------------------------
mtcars %>% select_loc(foo = c(bar = mpg, baz = cyl))
## -----------------------------------------------------------------------------
mtcars %>% select_loc(foo = c(mpg, cyl))
## -----------------------------------------------------------------------------
as.list(mtcars) %>% select_loc(foo = c(mpg, cyl))
## -----------------------------------------------------------------------------
mtcars %>% select_loc(foo = c(bar = c(mpg, cyl)))
## -----------------------------------------------------------------------------
iris %>% select_loc(!Species, foo = Sepal.Width)
## -----------------------------------------------------------------------------
iris %>% select_loc(where(is.numeric))
iris %>% select_loc(where(is.factor))
iris %>% select_loc(where(is.numeric) | where(is.factor))
iris %>% select_loc(where(is.numeric) & where(is.factor))
## -----------------------------------------------------------------------------
iris %>% select_loc(force(c(1, 3)))
## -----------------------------------------------------------------------------
iris %>% select_loc(force(c("Sepal.Length", "Petal.Length")))
## -----------------------------------------------------------------------------
iris %>% select_loc(force(is.numeric))
## -----------------------------------------------------------------------------
mask <- function(data, expr) {
rlang::eval_tidy(rlang::enquo(expr), data)
}
foo <- 10
cyl <- 200
# `cyl` represents the data frame column here:
mtcars %>% mask(cyl * foo)
## -----------------------------------------------------------------------------
mtcars %>% mask(!!cyl * foo)
mtcars %>% mask(.env$cyl * foo)
## ---- error = TRUE------------------------------------------------------------
cyl_pos <- 2
mtcars %>% select_loc(mpg | cyl_pos)
## ---- error = TRUE------------------------------------------------------------
mtcars %>% select_loc(all_of(mpg))
## -----------------------------------------------------------------------------
x <- data.frame(x = 1:3, y = 4:6, z = 7:9)
# `ncol(x)` is an env-expression, so `x` represents the data frame in
# the environment rather than the column in the data frame
x %>% select_loc(2:ncol(x))
## -----------------------------------------------------------------------------
y <- c("y", "z")
x %>% select_loc(all_of(y))
## -----------------------------------------------------------------------------
mtcars %>% select_loc(cyl_pos)
## ---- error = TRUE------------------------------------------------------------
mtcars %>% select_loc(cyl^2)
mtcars %>% select_loc(mpg * wt)
## ---- error = TRUE------------------------------------------------------------
mtcars %>% select_loc(mpg)
mtcars %>% rename_loc(mpg)
## ---- error = TRUE------------------------------------------------------------
# Lists can have duplicates
as.list(mtcars) %>% select_loc(foo = mpg, foo = cyl)
# Data frames cannot
mtcars %>% select_loc(foo = mpg, foo = cyl)
## ---- error = TRUE------------------------------------------------------------
mtcars %>% select_loc(cyl, cyl = mpg)
mtcars %>% select_loc(disp, cyl = mpg)
## ---- error = TRUE------------------------------------------------------------
mtcars %>% rename_loc(cyl, cyl = mpg)
mtcars %>% rename_loc(disp, cyl = mpg)
## -----------------------------------------------------------------------------
mtcars %>% select_loc(foo = cyl, cyl = mpg)
mtcars %>% rename_loc(foo = cyl, cyl = mpg)
## -----------------------------------------------------------------------------
dups <- vctrs::new_data_frame(list(x = 1, y = 2, x = 3))
## -----------------------------------------------------------------------------
dups %>% select_loc(y)
## ---- error = TRUE------------------------------------------------------------
dups %>% select_loc(x)
## -----------------------------------------------------------------------------
dups %>% select_loc(x, foo = 3)
dups %>% rename_loc(foo = 3)
## -----------------------------------------------------------------------------
mtcars %>% subset(select = c(cyl, hp:wt))
|
