Extract Column Names or Identifiers

Extract column names or identifiers from an object. For parametric basis objects, this returns tokens representing the type of variables (categorical or continuous).

Usage

columns(x, ...)

# S3 method for class 'event_model'
columns(x, ...)

Arguments

x

An object (typically a ParametricBasis)

...

Additional arguments passed to method-specific implementations.

Value

A character vector of column identifiers

Examples

dat <- data.frame(
  onsets = c(0, 4, 8),
  condition = factor(c("A", "B", "A")),
  run = 1
)
ev <- event_model(
  onsets ~ hrf(condition),
  data = dat,
  block = ~ run,
  sampling_frame = fmrihrf::sampling_frame(blocklens = 12, TR = 2)
)
columns(ev)
#> [1] "condition_condition.A" "condition_condition.B"