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\name{nrow}
\alias{nrow}
\alias{ncol}
\alias{NROW}
\alias{NCOL}
\title{The number of rows/columns of an array-like object}
\description{
Return the number of rows or columns present in an array-like object.
NOTE: This man page is for the \code{nrow}, \code{ncol}, \code{NROW} and
\code{NCOL} \emph{S4 generic functions} defined in the \pkg{BiocGenerics}
package.
See \code{?base::\link[base]{nrow}} for the default methods (defined in
the \pkg{base} package).
Bioconductor packages can define specific methods for objects
(typically matrix- or array-like) not supported by the default methods.
}
\usage{
nrow(x)
ncol(x)
NROW(x)
NCOL(x)
}
\arguments{
\item{x}{
A matrix- or array-like object.
}
}
\value{
A single integer or \code{NULL}.
Specific methods defined in Bioconductor packages should
behave as consistently as possible with the default methods.
}
\seealso{
\itemize{
\item \code{base::\link[base]{nrow}} for the default \code{nrow},
\code{ncol}, \code{NROW} and \code{NCOL} methods.
\item \code{\link[methods]{showMethods}} for displaying a summary of the
methods defined for a given generic function.
\item \code{\link[methods]{selectMethod}} for getting the definition of
a specific method.
\item \link[S4Vectors]{nrow,DataFrame-method} in the \pkg{S4Vectors}
package for an example of a specific \code{nrow} method (defined
for \link[S4Vectors]{DataFrame} objects).
\item \link{BiocGenerics} for a summary of all the generics defined
in the \pkg{BiocGenerics} package.
}
}
\examples{
nrow
showMethods("nrow")
selectMethod("nrow", "ANY") # the default method
ncol
showMethods("ncol")
selectMethod("ncol", "ANY") # the default method
NROW
showMethods("NROW")
selectMethod("NROW", "ANY") # the default method
NCOL
showMethods("NCOL")
selectMethod("NCOL", "ANY") # the default method
}
\keyword{methods}
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