xgboost: dimnames.xgb.DMatrix – R documentation

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dimnames.xgb.DMatrix

Handling of column names of xgb.DMatrix

Description

Only column names are supported for xgb.DMatrix, thus setting of row names would have no effect and returned row names would be NULL.

Usage

## S3 method for class 'xgb.DMatrix'
dimnames(x)

## S3 replacement method for class 'xgb.DMatrix'
dimnames(x) <- value

Arguments

`x`	object of class `xgb.DMatrix`
`value`	a list of two elements: the first one is ignored and the second one is column names

Details

Generic dimnames methods are used by colnames. Since row names are irrelevant, it is recommended to use colnames directly.

Examples

data(agaricus.train, package='xgboost')
train <- agaricus.train
dtrain <- xgb.DMatrix(train$data, label=train$label)
dimnames(dtrain)
colnames(dtrain)
colnames(dtrain) <- make.names(1:ncol(train$data))
print(dtrain, verbose=TRUE)

xgboost

Extreme Gradient Boosting

v1.4.1.1

Apache License (== 2.0) | file LICENSE

Authors

Tianqi Chen [aut], Tong He [aut, cre], Michael Benesty [aut], Vadim Khotilovich [aut], Yuan Tang [aut] (<https://orcid.org/0000-0001-5243-233X>), Hyunsu Cho [aut], Kailong Chen [aut], Rory Mitchell [aut], Ignacio Cano [aut], Tianyi Zhou [aut], Mu Li [aut], Junyuan Xie [aut], Min Lin [aut], Yifeng Geng [aut], Yutian Li [aut], XGBoost contributors [cph] (base XGBoost implementation)

Initial release

2021-04-22