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% File src/library/base/man/as.data.frame.Rd
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% File src/library/base/man/as.data.frame.Rd
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% Part of the R package, https://www.R-project.org
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% Part of the R package, https://www.R-project.org
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% Copyright 1995-2016 R Core Team
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% Copyright 1995-2018 R Core Team
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% Distributed under GPL 2 or later
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% Distributed under GPL 2 or later
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\name{as.data.frame}
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\name{as.data.frame}
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\title{Coerce to a Data Frame}
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\title{Coerce to a Data Frame}
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\alias{as.data.frame}
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\alias{as.data.frame}
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\method{as.data.frame}{list}(x, row.names = NULL, optional = FALSE, \dots,
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\method{as.data.frame}{list}(x, row.names = NULL, optional = FALSE, \dots,
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cut.names = FALSE, col.names = names(x), fix.empty.names = TRUE,
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cut.names = FALSE, col.names = names(x), fix.empty.names = TRUE,
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stringsAsFactors = default.stringsAsFactors())
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stringsAsFactors = default.stringsAsFactors())
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\method{as.data.frame}{matrix}(x, row.names = NULL, optional = FALSE, \dots,
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\method{as.data.frame}{matrix}(x, row.names = NULL, optional = FALSE,
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make.names = TRUE, \dots,
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stringsAsFactors = default.stringsAsFactors())
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stringsAsFactors = default.stringsAsFactors())
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is.data.frame(x)
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is.data.frame(x)
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}
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}
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\arguments{
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\arguments{
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\item{optional}{logical. If \code{TRUE}, setting row names and
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\item{optional}{logical. If \code{TRUE}, setting row names and
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converting column names (to syntactic names: see
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converting column names (to syntactic names: see
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\code{\link{make.names}}) is optional. Note that all of \R's
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\code{\link{make.names}}) is optional. Note that all of \R's
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\pkg{base} package \code{as.data.frame()} methods use
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\pkg{base} package \code{as.data.frame()} methods use
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\code{optional} only for column names treatment, basically with the
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\code{optional} only for column names treatment, basically with the
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meaning of \code{\link{data.frame}(*, check.names = !optional)}.}
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meaning of \code{\link{data.frame}(*, check.names = !optional)}.
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See also the \code{make.names} argument of the \code{matrix} method.}
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\item{\dots}{additional arguments to be passed to or from methods.}
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\item{\dots}{additional arguments to be passed to or from methods.}
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\item{stringsAsFactors}{logical: should the character vector be converted
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\item{stringsAsFactors}{logical: should the character vector be converted
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to a factor?}
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to a factor?}
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%% list method:
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%% list method:
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\item{cut.names}{logical or integer; indicating if column names with
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\item{cut.names}{logical or integer; indicating if column names with
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more than 256 (or \code{cut.names} if that is numeric) characters
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more than 256 (or \code{cut.names} if that is numeric) characters
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should be shortened (and the last 6 characters replaced by \code{" ..."}).}
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should be shortened (and the last 6 characters replaced by \code{" ..."}).}
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\item{col.names}{(optional) character vector of column names.}
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\item{col.names}{(optional) character vector of column names.}
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\item{fix.empty.names}{logical indicating if empty column names, i.e.,
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\item{fix.empty.names}{logical indicating if empty column names, i.e.,
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\code{""} should be fixed up (in \code{\link{data.frame}}) or not.}
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\code{""} should be fixed up (in \code{\link{data.frame}}) or not.}
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%% matrix method:
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\item{make.names}{a \code{\link{logical}}, i.e., one of \code{FALSE, NA, TRUE},
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indicating what should happen if the row names (of the matrix
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\code{x}) are invalid. If they are invalid, the default,
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\code{TRUE}, calls \code{\link{make.names}(*, unique=TRUE)};
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\code{make.names=NA} will use \dQuote{automatic} row names and a
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\code{FALSE} value will signal an error for invalid row names.}
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}
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}
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\value{
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\value{
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\code{as.data.frame} returns a data frame, normally with all row names
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\code{as.data.frame} returns a data frame, normally with all row names
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\code{""} if \code{optional = TRUE}.
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\code{""} if \code{optional = TRUE}.
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