Column lens

Create a lens into a set of columns

cols_l(cols, drop = FALSE)

Arguments

cols	the columns to focus on
drop	whether or not to drop dimensions with length 1

Examples

x <- matrix(1:4, ncol = 2)
colnames(x) <- c("first", "second")
x
#>      first second
#> [1,]     1      3
#> [2,]     2      4

view(x, cols_l(1))
#>      first
#> [1,]     1
#> [2,]     2
view(x, cols_l("second"))
#>      second
#> [1,]      3
#> [2,]      4
set(x, cols_l(1), c(20,40))
#>      first second
#> [1,]    20      3
#> [2,]    40      4