slice

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

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

Usage
slice(object, ...)
"slice"(object, idxset, ...)
"["(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)
Aliases
  • [.xgb.DMatrix
  • slice
  • slice.xgb.DMatrix
Examples
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)

Documentation reproduced from package xgboost, version 0.6-3, License: Apache License (== 2.0) | file LICENSE

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