Extract the selected features from a featR result

The generic accessor for the one thing every featR method produces: the names of the features it kept. Equivalent to x$selected, but stable against future changes in the internal layout, and safe to call on the result of any fs_*() selection function.

Usage

selected(x, ...)

# S3 method for class 'fs_result'
selected(x, ...)

Arguments

x

An fs_result object.

...

Unused, for future methods.

Value

A character vector of selected feature names, possibly empty when nothing met the selection criteria.

Examples

res <- fs_unsupervised(
  data.frame(a = c(1, 5, 2, 8), b = c(1, 1, 1, 1)),
  method = "variance", threshold = 0.5
)
selected(res)
#> [1] "a"

# Empty selections are returned as character(0), not NULL
none <- suppressWarnings(
  fs_unsupervised(
    data.frame(a = c(1, 5, 2, 8), b = c(1, 1, 1, 1)),
    method = "variance", threshold = 1e6
  )
)
selected(none)
#> character(0)