R: Tabulates the values in a matrix by row (column)

rowTabulates {matrixStats}

R Documentation

Tabulates the values in a matrix by row (column)

Description

Tabulates the values in a matrix by row (column).

Usage

rowTabulates(x, rows = NULL, cols = NULL, values = NULL, ...)

colTabulates(x, rows = NULL, cols = NULL, values = NULL, ...)

Arguments

`x`	An `integer`, a `logical`, or a `raw` NxK `matrix`.
`rows, cols`	A `vector` indicating subset of rows (and/or columns) to operate over. If `NULL`, no subsetting is done.
`values`	An `vector` of J values of count. If `NULL`, all (unique) values are counted.
`...`	Not used.

Value

Returns a NxJ (KxJ) matrix where N (K) is the number of row (column) vectors tabulated and J is the number of values counted.

Author(s)

Henrik Bengtsson

Examples

x <- matrix(1:5, nrow = 10, ncol = 5)
print(x)
print(rowTabulates(x))
print(colTabulates(x))
# Count only certain values
print(rowTabulates(x, values = 1:3))


y <- as.raw(x)
dim(y) <- dim(x)
print(y)
print(rowTabulates(y))
print(colTabulates(y))

[Package matrixStats version 0.54.0 Index]