Slice lens

Create a lens into a specific slice of a specific dimension of a multidimensional object. Not to be confused with dplyr slice.

slice_l(dimension, slice, drop = FALSE)

Arguments

dimension	the dimension to slice
slice	the slice index
drop	whether or not to drop dimensions with length 1. Only applies to view.

Examples

(x <- matrix(1:4, ncol = 2))
#>      [,1] [,2]
#> [1,]    1    3
#> [2,]    2    4
view(x, slice_l(1, 2)) # x[2,, drop = FALSE]
#>      [,1] [,2]
#> [1,]    2    4
view(x, slice_l(2, 2)) # x[,2, drop = FALSE]
#>      [,1]
#> [1,]    3
#> [2,]    4
set(x, slice_l(1,1), c(10,20))
#>      [,1] [,2]
#> [1,]   10   20
#> [2,]    2    4