% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/methods.R, R/methods_row.R
\name{colProds,dgCMatrix-method}
\alias{colProds,dgCMatrix-method}
\alias{rowProds,dgCMatrix-method}
\title{Calculates the product for each row (column) in a matrix}
\usage{
\S4method{colProds}{dgCMatrix}(x, rows = NULL, cols = NULL, na.rm = FALSE)

\S4method{rowProds}{dgCMatrix}(x, rows = NULL, cols = NULL, na.rm = FALSE)
}
\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.}

are excluded first, otherwise not.}
}
\value{
}
\description{
Calculates the product for each row (column) in a matrix
}
\details{
Attention: This method ignores the order of the values, because it assumes that
the product is commutative. Unfortunately, for 'double' this is not true.
For example NaN * NA = NaN, but NA * NaN = NA. This is relevant for this
function if there are +-Inf, because Inf * 0 = NaN. This function returns
NA whenever there is NA in the input. This is different from matrixStats::colProds().
}
\examples{
mat <- matrix(rnorm(15), nrow = 5, ncol = 3)
mat[2, 1] <- NA
mat[3, 3] <- Inf
mat[4, 1] <- 0

print(mat)

rowProds(mat)
colProds(mat)
}
\seealso{
\itemize{