% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/xgb.Booster.R
\name{xgb.parameters<-}
\alias{xgb.parameters<-}
\title{Accessors for model parameters}
\usage{
xgb.parameters(object) <- value
}
\arguments{
\item{object}{Object of class \code{xgb.Booster}. \bold{Will be modified in-place}.}

\item{value}{A list (or an object coercible to a list) with the names of parameters to set
and the elements corresponding to parameter values.}
}
\value{
The same booster \code{object}, which gets modified in-place.
}
\description{
Only the setter for xgboost parameters is currently implemented.
}
\details{
Just like \link{xgb.attr}, this function will make in-place modifications
on the booster object which do not follow typical R assignment semantics - that is,
all references to the same booster will also be updated, unlike assingment of R
attributes which follow copy-on-write semantics.

See \link{xgb.copy.Booster} for an example of this behavior.

Be aware that setting parameters of a fitted booster related to training continuation / updates
will reset its number of rounds indicator to zero.
}
\examples{
data(agaricus.train, package = "xgboost")
train <- agaricus.train

bst <- xgboost(
  data = train$data,
  label = train$label,
  max_depth = 2,
  eta = 1,
  nthread = 2,
  nrounds = 2,
  objective = "binary:logistic"
)

xgb.parameters(bst) <- list(eta = 0.1)

}
