Construct a lens into a subset of an object

Source: R/base-lenses.R

This is the lens version of [

indexes_l(els)

indexes(els)

Arguments

els

a subset vector, can be integer, character of logical, pointing to one or more elements of the object

Functions

  • indexes: shorthand

Examples

x <- 1:10
view(x, indexes_l(3:5))
#> [1] 3 4 5
set(x, indexes_l(c(1,10)), NA)
#>  [1] NA  2  3  4  5  6  7  8  9 NA
head(view(iris, indexes_l(c("Sepal.Length", "Species"))))
#>   Sepal.Length Species
#> 1          5.1  setosa
#> 2          4.9  setosa
#> 3          4.7  setosa
#> 4          4.6  setosa
#> 5          5.0  setosa
#> 6          5.4  setosa