Identify Original Variables Used by a Projector

Determines which columns from the original input space contribute (have non-zero influence) to any of the output components of the projector.

Usage

variables_used(x, ...)

# S3 method for class 'composed_projector'
variables_used(x, tol = 1e-08, ...)

Arguments

x

A projector object (e.g., projector, composed_projector).

...

Additional arguments passed to specific methods.

tol

Numeric tolerance for determining non-zero coefficients. Default is 1e-8 for some methods. Passed via ....

Value

A sorted numeric vector of unique indices corresponding to the original input variables.