% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/xgb.DMatrix.R
\name{getinfo}
\alias{getinfo}
\alias{getinfo.xgb.DMatrix}
\title{Get information of an xgb.DMatrix object}
\usage{
getinfo(object, name)

\method{getinfo}{xgb.DMatrix}(object, name)
}
\arguments{
\item{object}{Object of class \code{xgb.DMatrix}}

\item{name}{the name of the information field to get (see details)}
}
\description{
Get information of an xgb.DMatrix object
}
\details{
The \code{name} field can be one of the following:

\itemize{
\item \code{label}
\item \code{weight}
\item \code{base_margin}
\item \code{label_lower_bound}
\item \code{label_upper_bound}
\item \code{group}
\item \code{feature_type}
\item \code{feature_name}
\item \code{nrow}
}
See the documentation for \link{xgb.DMatrix} for more information about these fields.

Note that, while 'qid' cannot be retrieved, it's possible to get the equivalent 'group'
for a DMatrix that had 'qid' assigned.
}
\examples{
data(agaricus.train, package='xgboost')
dtrain <- with(agaricus.train, xgb.DMatrix(data, label = label, nthread = 2))

labels <- getinfo(dtrain, 'label')
setinfo(dtrain, 'label', 1-labels)

labels2 <- getinfo(dtrain, 'label')
stopifnot(all(labels2 == 1-labels))
}