% File src/library/stats/man/complete.cases.Rd
% Part of the R package, https://www.R-project.org
% Copyright 1995-2015 R Core Team
% Distributed under GPL 2 or later

\name{complete.cases}
\alias{complete.cases}
\title{Find Complete Cases}
\description{
  Return a logical vector indicating which cases are complete, i.e.,
  have no missing values.
}
\usage{
complete.cases(\dots)
}
\arguments{
  \item{\dots}{a sequence of vectors, matrices and data frames.}
}
\value{
  A logical vector specifying which observations/rows have no missing
  values across the entire sequence.
}
\note{
  A current limitation of this function is that it uses low level
  functions to determine lengths and missingness, ignoring the 
  class.  This will lead to spurious errors when some columns
  have classes with \code{\link{length}} or \code{\link{is.na}}
  methods, for example \code{"\link{POSIXlt}"}, as described
  in \PR{16648}.
}
\seealso{
  \code{\link{is.na}},
  \code{\link{na.omit}},
  \code{\link{na.fail}}.
}
\examples{
x <- airquality[, -1] # x is a regression design matrix
y <- airquality[,  1] # y is the corresponding response

stopifnot(complete.cases(y) != is.na(y))
ok <- complete.cases(x, y)
sum(!ok) # how many are not "ok" ?
x <- x[ok,]
y <- y[ok]
}
\keyword{NA}
\keyword{logic}