https://github.com/hadley/dplyr
Tip revision: 7681a076724805948a9d668d6281377f39f0a63b authored by Romain Francois on 04 December 2020, 18:46:57 UTC
ungroup() before vec_slice()
ungroup() before vec_slice()
Tip revision: 7681a07
arrange.Rd
% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/arrange.R
\name{arrange}
\alias{arrange}
\alias{arrange.data.frame}
\title{Arrange rows by column values}
\usage{
arrange(.data, ..., .by_group = FALSE)
\method{arrange}{data.frame}(.data, ..., .by_group = FALSE)
}
\arguments{
\item{.data}{A data frame, data frame extension (e.g. a tibble), or a
lazy data frame (e.g. from dbplyr or dtplyr). See \emph{Methods}, below, for
more details.}
\item{...}{<\code{\link[=dplyr_data_masking]{data-masking}}> Variables, or functions or
variables. Use \code{\link[=desc]{desc()}} to sort a variable in descending order.}
\item{.by_group}{If \code{TRUE}, will sort first by grouping variable. Applies to
grouped data frames only.}
}
\value{
An object of the same type as \code{.data}. The output has the following
properties:
\itemize{
\item All rows appear in the output, but (usually) in a different place.
\item Columns are not modified.
\item Groups are not modified.
\item Data frame attributes are preserved.
}
}
\description{
\code{arrange()} orders the rows of a data frame by the values of selected
columns.
Unlike other dplyr verbs, \code{arrange()} largely ignores grouping; you
need to explicitly mention grouping variables (or use \code{.by_group = TRUE})
in order to group by them, and functions of variables are evaluated
once per data frame, not once per group.
}
\details{
\subsection{Locales}{
The sort order for character vectors will depend on the collating sequence
of the locale in use: see \code{\link[=locales]{locales()}}.
}
\subsection{Missing values}{
Unlike base sorting with \code{sort()}, \code{NA} are:
\itemize{
\item always sorted to the end for local data, even when wrapped with \code{desc()}.
\item treated differently for remote data, depending on the backend.
}
}
}
\section{Methods}{
This function is a \strong{generic}, which means that packages can provide
implementations (methods) for other classes. See the documentation of
individual methods for extra arguments and differences in behaviour.
The following methods are currently available in loaded packages:
\Sexpr[stage=render,results=rd]{dplyr:::methods_rd("arrange")}.
}
\examples{
arrange(mtcars, cyl, disp)
arrange(mtcars, desc(disp))
# grouped arrange ignores groups
by_cyl <- mtcars \%>\% group_by(cyl)
by_cyl \%>\% arrange(desc(wt))
# Unless you specifically ask:
by_cyl \%>\% arrange(desc(wt), .by_group = TRUE)
# use embracing when wrapping in a function;
# see ?dplyr_data_masking for more details
tidy_eval_arrange <- function(.data, var) {
.data \%>\%
arrange({{ var }})
}
tidy_eval_arrange(mtcars, mpg)
# use across() access select()-style semantics
iris \%>\% arrange(across(starts_with("Sepal")))
iris \%>\% arrange(across(starts_with("Sepal"), desc))
}
\seealso{
Other single table verbs:
\code{\link{filter}()},
\code{\link{mutate}()},
\code{\link{rename}()},
\code{\link{select}()},
\code{\link{slice}()},
\code{\link{summarise}()}
}
\concept{single table verbs}