Takes a base-learner and extracts information.

1 2 3 |

`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 |

`expand` |
a logical indicating whether the design matrix should be expanded
(default: |

`...` |
currently not used |

`extract`

for the `extract`

function of the package mboost

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