new nrow function for xgb.DMatrix

R-package/man/nrow.Rd

@@ -0,0 +1,22 @@
+% Generated by roxygen2 (4.1.0): do not edit by hand
+% Please edit documentation in R/nrow.xgb.DMatrix.R
+\docType{methods}
+\name{nrow,xgb.DMatrix-method}
+\alias{nrow,xgb.DMatrix-method}
+\title{\code{nrow} return the number of rows present in x.}
+\usage{
+\S4method{nrow}{xgb.DMatrix}(x)
+}
+\arguments{
+\item{x}{Object of class \code{xgb.DMatrix}}
+}
+\description{
+\code{nrow} return the number of rows present in x.
+}
+\examples{
+data(agaricus.train, package='xgboost')
+train <- agaricus.train
+dtrain <- xgb.DMatrix(train$data, label=train$label)
+stopifnot(nrow(dtrain) == nrow(train$data))
+}
+