Tidyverse selections implement a dialect of R where operators make it easy to select variables:
:
for selecting a range of consecutive variables.!
for taking the complement of a set of variables.&
and |
for selecting the intersection or the union of two
sets of variables.c()
for combining selections.In addition, you can use selection helpers. Some helpers select specific columns:
everything()
][tidyselect::everything]: Matches all variables.last_col()
][tidyselect::last_col]: Select last variable, possibly with an offset.Other helpers select variables by matching patterns in their names:
starts_with()
][tidyselect::starts_with]: Starts with a prefix.ends_with()
][tidyselect::ends_with()]: Ends with a suffix.contains()
][tidyselect::contains()]: Contains a literal string.matches()
][tidyselect::matches()]: Matches a regular expression.num_range()
][tidyselect::num_range()]: Matches a numerical range like x01, x02, x03.Or from variables stored in a character vector:
all_of()
][tidyselect::all_of()]: Matches variable names in a character vector. All
names must be present, otherwise an out-of-bounds error is
thrown.any_of()
][tidyselect::any_of()]: Same as all_of()
, except that no error is thrown
for names that don't exist.Or using a predicate function:
where()
][tidyselect::where()]: Applies a function to all variables and selects those
for which the function returns TRUE
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