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% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/colDiffs.R, R/rowDiffs.R
\name{colDiffs,DelayedMatrix-method}
\alias{colDiffs,DelayedMatrix-method}
\alias{rowDiffs,DelayedMatrix-method}
\title{Calculates the difference between each element of a row (column) of a
matrix-like object}
\usage{
\S4method{colDiffs}{DelayedMatrix}(
x,
rows = NULL,
cols = NULL,
lag = 1L,
differences = 1L,
force_block_processing = FALSE,
...,
useNames = TRUE
)
\S4method{rowDiffs}{DelayedMatrix}(
x,
rows = NULL,
cols = NULL,
lag = 1L,
differences = 1L,
force_block_processing = FALSE,
...,
useNames = TRUE
)
}
\arguments{
\item{x}{A NxK \linkS4class{DelayedMatrix}.}
\item{rows, 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{lag}{An integer specifying the lag.}
\item{differences}{An integer specifying the order of difference.}
\item{force_block_processing}{\code{FALSE} (the default) means that a
seed-aware, optimised method is used (if available). This can be overridden
to use the general block-processing strategy by setting this to \code{TRUE}
(typically not advised). The block-processing strategy loads one or more
(depending on \verb{\link[DelayedArray]\{getAutoBlockSize\}()}) columns (\code{colFoo()})
or rows (\code{rowFoo()}) into memory as an ordinary \link[base:array]{base::array}.}
\item{...}{Additional arguments passed to specific methods.}
\item{useNames}{If \code{\link{TRUE}} (default), names attributes of result are set. Else if \code{\link{FALSE}}, no naming support is done.}
}
\value{
Returns a \code{\link{numeric}} \code{\link{matrix}} with one column
(row) less than x: \eqn{Nx(K-1)} or \eqn{(N-1)xK}.
}
\description{
Calculates the difference between each element of a row (column) of a
matrix-like object.
}
\details{
The S4 methods for \code{x} of type \code{\link{matrix}},
\code{\link{array}}, \code{\link{table}}, or \code{\link{numeric}} call
\code{matrixStats::\link[matrixStats]{rowDiffs}} /
\code{matrixStats::\link[matrixStats]{colDiffs}}.
}
\examples{
# A DelayedMatrix with a 'matrix' seed
dm_matrix <- DelayedArray(matrix(c(rep(1L, 5),
as.integer((0:4) ^ 2),
seq(-5L, -1L, 1L)),
ncol = 3))
# A DelayedMatrix with a 'HDF5ArraySeed' seed
# NOTE: Requires that the HDF5Array package is installed
library(HDF5Array)
dm_HDF5 <- writeHDF5Array(matrix(c(rep(1L, 5),
as.integer((0:4) ^ 2),
seq(-5L, -1L, 1L)),
ncol = 3))
colDiffs(dm_matrix)
rowDiffs(dm_HDF5)
# In reverse column order
rowDiffs(dm_HDF5, cols = seq(ncol(dm_HDF5), 1, -1))
}
\seealso{
\itemize{
\item \code{matrixStats::\link[matrixStats]{rowDiffs}()} and
\code{matrixStats::\link[matrixStats:rowDiffs]{colDiffs}()} which are used
when the input is a \code{matrix} or \code{numeric} vector.
\item \code{base::\link{diff}()}.
}
}
\author{
Peter Hickey
}
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