In lionel-/selectr: Select from a Set of Strings

tidyselect implements a DSL for selecting variables. It provides helpers for selecting variables:

• var1:var10: variables lying between var1 on the left and var10 on the right.
• [starts_with("a")][tidyselect::starts_with]: names that start with "a".
• [ends_with("z")][tidyselect::ends_with]: names that end with "z".
• [contains("b")][tidyselect::contains]: names that contain "b".
• [matches("x.y")][tidyselect::matches]: names that match regular expression x.y.
• [num_range(x, 1:4)][tidyselect::num_range]: names following the pattern, x1, x2, ..., x4.
• [all_of(vars)][tidyselect::all_of]/[any_of(vars)][tidyselect::any_of()]: matches names stored in the character vector vars. all_of(vars) will error if the variables aren't present; any_of(var) will match just the variables that exist.
• [everything()][tidyselect::everything]: all variables.
• [last_col()][tidyselect::last_col]: furthest column on the right.
• [where(is.numeric)][tidyselect::where]: all variables where is.numeric() returns TRUE.

As well as operators for combining those selections:

• !selection: only variables that don't match selection.
• selection1 & selection2: only variables included in both selection1 and selection2.
• selection1 | selection2: all variables that match either selection1 or selection2.

When writing code inside packages you can substitute "var" for var to avoid R CMD check notes.

lionel-/selectr documentation built on March 14, 2024, 10:04 p.m.