39 lines
1.2 KiB
R
39 lines
1.2 KiB
R
% Generated by roxygen2: do not edit by hand
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% Please edit documentation in R/xgb.DMatrix.R
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\name{xgb.slice.DMatrix}
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\alias{xgb.slice.DMatrix}
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\alias{[.xgb.DMatrix}
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\title{Slice DMatrix}
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\usage{
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xgb.slice.DMatrix(object, idxset, allow_groups = FALSE)
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\method{[}{xgb.DMatrix}(object, idxset, colset = NULL)
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}
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\arguments{
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\item{object}{Object of class \code{xgb.DMatrix}.}
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\item{idxset}{An integer vector of indices of rows needed (base-1 indexing).}
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\item{allow_groups}{Whether to allow slicing an \code{xgb.DMatrix} with \code{group} (or
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equivalently \code{qid}) field. Note that in such case, the result will not have
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the groups anymore - they need to be set manually through \code{\link[=setinfo]{setinfo()}}.}
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\item{colset}{Currently not used (columns subsetting is not available).}
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}
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\description{
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Get a new DMatrix containing the specified rows of original xgb.DMatrix object.
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}
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\examples{
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data(agaricus.train, package = "xgboost")
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dtrain <- with(agaricus.train, xgb.DMatrix(data, label = label, nthread = 2))
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dsub <- xgb.slice.DMatrix(dtrain, 1:42)
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labels1 <- getinfo(dsub, "label")
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dsub <- dtrain[1:42, ]
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labels2 <- getinfo(dsub, "label")
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all.equal(labels1, labels2)
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}
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