slice.xgb.DMatrix: Get a new DMatrix containing the specified rows of original...

Description Usage Arguments Examples

View source: R/xgb.DMatrix.R

Description

Get a new DMatrix containing the specified rows of original xgb.DMatrix object

Usage

1
2
3
4
5
6
7
slice(object, ...)

## S3 method for class 'xgb.DMatrix'
slice(object, idxset, ...)

## S3 method for class 'xgb.DMatrix'
object[idxset, colset = NULL]

Arguments

object

Object of class "xgb.DMatrix"

...

other parameters (currently not used)

idxset

a integer vector of indices of rows needed

colset

currently not used (columns subsetting is not available)

Examples

1
2
3
4
5
6
7
8
9
data(agaricus.train, package='xgboost')
train <- agaricus.train
dtrain <- xgb.DMatrix(train$data, label=train$label)

dsub <- slice(dtrain, 1:42)
labels1 <- getinfo(dsub, 'label')
dsub <- dtrain[1:42, ]
labels2 <- getinfo(dsub, 'label')
all.equal(labels1, labels2)

xgboost documentation built on April 22, 2021, 5:06 p.m.