colDiffs,DelayedMatrix-method {DelayedMatrixStats} | R Documentation |
Calculates the difference between each element of a row (column) of a matrix-like object.
## S4 method for signature 'DelayedMatrix' colDiffs( x, rows = NULL, cols = NULL, lag = 1L, differences = 1L, force_block_processing = FALSE, ... ) ## S4 method for signature 'DelayedMatrix' rowDiffs( x, rows = NULL, cols = NULL, lag = 1L, differences = 1L, force_block_processing = FALSE, ... )
x |
A NxK DelayedMatrix. |
rows |
A |
cols |
A |
lag |
An integer specifying the lag. |
differences |
An integer specifying the order of difference. |
force_block_processing |
|
... |
Additional arguments passed to specific methods. |
The S4 methods for x
of type matrix
,
array
, or numeric
call
matrixStats::rowDiffs
/ matrixStats::colDiffs
.
Returns a numeric
matrix
with one column
(row) less than x: Nx(K-1) or (N-1)xK.
Peter Hickey
matrixStats::rowDiffs()
and
matrixStats::colDiffs()
which are used
when the input is a matrix
or numeric
vector.
base::diff()
.
# 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))