matrixStats (version 1.0.0)

rowMeans2: Calculates the mean for each row (column) in a matrix

Description

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

Usage

rowMeans2(x, rows = NULL, cols = NULL, na.rm = FALSE, refine = TRUE,
  dim. = dim(x), ..., useNames = TRUE)
colMeans2(x, rows = NULL, cols = NULL, na.rm = FALSE, refine = TRUE,
  dim. = dim(x), ..., useNames = TRUE)

Value

Returns a numeric

vector of length N (K).

Arguments

x

An NxK matrix or, if dim. is specified, an N * K vector.

rows

A vector indicating subset of rows to operate over. If NULL, no subsetting is done.

cols

A vector indicating subset of columns to operate over. If NULL, no subsetting is done.

na.rm

If TRUE, missing values are excluded.

refine

If TRUE and x is numeric, then extra effort is used to calculate the average with greater numerical precision, otherwise not.

dim.

An integer vector of length two specifying the dimension of x, also when not a matrix. Comment: The reason for this argument being named with a period at the end is purely technical (we get a run-time error if we try to name it dim).

...

Not used.

useNames

If FALSE (default), no naming support is done. Else if TRUE, names attributes of result are set.

Author

Henrik Bengtsson

Details

The implementation of rowMeans2() and colMeans2() is optimized for both speed and memory.