FDboost: extract.blg – R documentation

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extract.blg

Extract information of a base-learner

Takes a base-learner and extracts information.

## S3 method for class 'blg'
extract(
  object,
  what = c("design", "penalty", "index"),
  asmatrix = FALSE,
  expand = FALSE,
  ...
)

`object`	a base-learner
`what`	a character specifying the quantities to extract. This can be a subset of "design" (default; design matrix), "penalty" (penalty matrix) and "index" (index of ties used to expand the design matrix)
`asmatrix`	a logical indicating whether the the returned matrix should be coerced to a matrix (default) or if the returned object stays as it is (i.e., potentially a sparse matrix). This option is only applicable if `extract` returns matrices, i.e., `what = "design"` or `what = "penalty"`.
`expand`	a logical indicating whether the design matrix should be expanded (default: `FALSE`). This is useful if ties were taken into account either manually (via argument `index` in a base-learner) or automatically for data sets with many observations. `expand = TRUE` is equivalent to `extract(B)[extract(B, what = "index"),]` for a base-learner `B`.
`...`	currently not used