In javifar/TIDYVERSE-DPLYR: A Grammar of Data Manipulation

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.

These 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.

These helpers select variables from 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.

This helper selects variables with a function: * [where()][tidyselect::where()]: Applies a function to all variables and selects those for which the function returns TRUE.

javifar/TIDYVERSE-DPLYR documentation built on Dec. 20, 2021, 9:08 p.m.