Get a new DMatrix containing the specified rows of original xgb.DMatrix object
Get a new DMatrix containing the specified rows of original xgb.DMatrix object
slice(object, ...) ## S3 method for class 'xgb.DMatrix' slice(object, idxset, ...) ## S3 method for class 'xgb.DMatrix' object[idxset, colset = NULL]
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) |
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)
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