Construct a basis space from a synthesis dictionary — basis_space_from_decoder • fmridataset

Computes the exact unregularized least-squares encoder (D' D)^{-1} D' for a full-column-rank decoder D.

Usage

basis_space_from_decoder(
  parent,
  component_ids,
  decoder,
  data = NULL,
  basis_type = "linear_basis",
  provenance = list(),
  tolerance = 1e-08,
  metadata = list(),
  encoder = c("least_squares", "none")
)

Arguments

parent, component_ids, decoder, data, basis_type, provenance, tolerance, metadata: Passed to basis_space().
encoder: Either "least_squares" to construct and validate the exact unregularized left inverse, or "none" for a synthesis-only basis.

Value

A basis_space.

Examples

parent <- volume_space(c(2, 1, 1), support = 1:2)
x <- basis_space_from_decoder(parent, c("c1", "c2"), diag(2))
basis_synthesis(x)
#>      [,1] [,2]
#> [1,]    1    0
#> [2,]    0    1