Dimensions of xgb.DMatrix

Returns a vector of numbers of rows and of columns in an xgb.DMatrix.

Usage

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

Arguments

x

Object of class xgb.DMatrix

Details

Note: since nrow() and ncol() internally use dim(), they can also be directly used with an xgb.DMatrix object.

Examples

data(agaricus.train, package = "xgboost")

train <- agaricus.train
dtrain <- xgb.DMatrix(train$data, label = train$label, nthread = 2)

stopifnot(nrow(dtrain) == nrow(train$data))
stopifnot(ncol(dtrain) == ncol(train$data))
stopifnot(all(dim(dtrain) == dim(train$data)))