matrixStats (version 0.53.0)

rowSums2: Calculates the sum for each row (column) in a matrix

Description

Calculates the sum for each row (column) in a matrix.

Usage

rowSums2(x, rows = NULL, cols = NULL, na.rm = FALSE, dim. = dim(x), ...)
colSums2(x, rows = NULL, cols = NULL, na.rm = FALSE, dim. = dim(x), ...)

Arguments

x

A numeric or a logical NxK matrix.

rows, cols

A vector indicating subset of rows (and/or columns) to operate over. If NULL, no subsetting is done.

na.rm

If TRUE, NAs are excluded first, otherwise not.

dim.

An integer vector of length two specifying the dimension of x, also when not a matrix.

...

Not used.

Value

Returns a numeric vector of length N (K).

Details

The implementation of rowSums2() and colSums2() is optimized for both speed and memory.