matrixStats (version 0.53.0)

rowDiffs: 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.

See Also

See also diff2().

Examples

# NOT RUN {
x <- matrix(1:27, ncol = 3)

d1 <- rowDiffs(x)
print(d1)

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