R: Extract gblinear coefficients history.

xgb.gblinear.history {xgboost} | R Documentation

## Extract gblinear coefficients history.

### Description

A helper function to extract the matrix of linear coefficients' history from a gblinear model created while using the `cb.gblinear.history()` callback.

### Usage

    xgb.gblinear.history(model, class_index = NULL)

### Arguments

`model` | either an `xgb.Booster` or a result of `xgb.cv()`, trained using the `cb.gblinear.history()` callback.
`class_index` | zero-based class index to extract the coefficients for only that specific class in a multinomial multiclass model. When it is NULL, all the coefficients are returned. Has no effect in non-multiclass models.

### Value

For an `xgb.train` result, a matrix (either dense or sparse) with the columns corresponding to iteration's coefficients (in the order as `xgb.dump()` would return) and the rows corresponding to boosting iterations.

For an `xgb.cv` result, a list of such matrices is returned with the elements corresponding to CV folds.

[Package xgboost version 0.82.0.1 Index]