R: Calculates difference for each row (column) in a matrix

rowDiffs {matrixStats}

R Documentation

Calculates difference for each row (column) in a matrix

Description

Calculates difference for each row (column) in a matrix.

Usage

rowDiffs(x, rows = NULL, cols = NULL, lag = 1L, differences = 1L,
  dim. = dim(x), ...)

colDiffs(x, rows = NULL, cols = NULL, lag = 1L, differences = 1L,
  dim. = dim(x), ...)

Arguments

`x`	A `numeric` NxK `matrix`.
`rows, cols`	A `vector` indicating subset of rows (and/or columns) to operate over. If `NULL`, no subsetting is done.
`lag`	An `integer` specifying the lag.
`differences`	An `integer` specifying the order of difference.
`dim.`	An `integer` `vector` of length two specifying the dimension of `x`, also when not a `matrix`.
`...`	Not used.

Value

Returns a numeric Nx(K-1) or (N-1)xK matrix.

Author(s)

Henrik Bengtsson

Examples

x <- matrix(1:27, ncol = 3)

d1 <- rowDiffs(x)
print(d1)

d2 <- t(colDiffs(t(x)))
stopifnot(all.equal(d2, d1))

[Package matrixStats version 0.54.0 Index]