modify_if {mlr3misc}

Selectively Modify Elements of a Vector

Description

Modifies elements of a vector selectively, similar to the functions in purrr.

modify_if() applies a predicate function .p to all elements of .x and applies .f to those elements of .x where .p evaluates to TRUE.

modify_at() applies .f to those elements of .x selected via .at.

Usage

modify_if(.x, .p, .f, ...)

modify_at(.x, .at, .f, ...)

Arguments

.x

(vector()).

.p

(⁠function()⁠)
Predicate function.

.f

(⁠function()⁠)
Function to apply on .x.

...

(any)
Additional arguments passed to .f.

.at

((integer() | character()))
Index vector to select elements from .x.

Examples

x = modify_if(iris, is.factor, as.character)
str(x)

x = modify_at(iris, 5, as.character)
x = modify_at(iris, "Sepal.Length", sqrt)
str(x)