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% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/methods.R, R/methods_row.R
\name{colCounts,xgCMatrix-method}
\alias{colCounts,xgCMatrix-method}
\alias{rowCounts,xgCMatrix-method}
\title{Count how often an element in a row (column) of a matrix-like object is
equal to a value}
\usage{
\S4method{colCounts}{xgCMatrix}(
x,
rows = NULL,
cols = NULL,
value = TRUE,
na.rm = FALSE,
useNames = NA
)
\S4method{rowCounts}{xgCMatrix}(
x,
rows = NULL,
cols = NULL,
value = TRUE,
na.rm = FALSE,
useNames = NA
)
}
\arguments{
\item{x}{An NxK matrix-like object.}
\item{rows}{A \code{\link{vector}} indicating the subset of rows
(and/or columns) to operate over. If \code{\link{NULL}}, no subsetting is
done.}
\item{cols}{A \code{\link{vector}} indicating the subset of rows
(and/or columns) to operate over. If \code{\link{NULL}}, no subsetting is
done.}
\item{value}{The value to search for.}
\item{na.rm}{If \code{\link[base:logical]{TRUE}}, \code{\link{NA}}s
are excluded first, otherwise not.}
\item{useNames}{If \code{\link{NA}}, the default behavior of the function about naming support is remained. If \code{\link{FALSE}}, no naming support is done. Else if \code{\link{TRUE}}, names attributes of result are set.}
}
\value{
Returns a \code{\link{integer}} \code{\link{vector}} of length N (K).
}
\description{
Count how often an element in a row (column) of a matrix-like object is
equal to a value.
}
\details{
The S4 methods for \code{x} of type \code{\link{matrix}},
\code{\link{array}}, or \code{\link{numeric}} call
\code{matrixStats::rowCounts}
/ \code{matrixStats::colCounts}.
}
\examples{
mat <- matrix(rnorm(15), nrow = 5, ncol = 3)
mat[2, 1] <- NA
mat[3, 3] <- Inf
mat[4, 1] <- 0
print(mat)
rowCounts(mat)
colCounts(mat)
rowCounts(mat, value = 0)
colCounts(mat, value = Inf, na.rm = TRUE)
}
\seealso{
\itemize{
\item \code{matrixStats::\link[matrixStats]{rowCounts}()} and
\code{matrixStats::\link[matrixStats:rowCounts]{colCounts}()} which are
used when the input is a \code{matrix} or \code{numeric} vector.
\item For checks if any element is equal to a value, see
\code{\link[MatrixGenerics]{rowAnys}()}. To check if all elements are equal, see
\code{\link[MatrixGenerics]{rowAlls}()}.
}
}
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