matrixStats (version 0.1.5)

rowMedians: Calculates the median for each row (column) in a matrix

Description

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

Usage

rowMedians(x, na.rm=FALSE, ...)
 colMedians(x, na.rm=FALSE, ...)

Arguments

x

A numeric NxK matrix.

na.rm

If TRUE, NAs are excluded first, otherwise not.

...

Not used.

Value

• Returns a numeric vector of length N (K).

Details

The implementation of rowMedians() is optimized for both speed and memory. To avoid coercing to doubles (and hence memory allocation), there is a unique implementation for integer matrices, that is, if x is an integer matrix, then rowMedians(as.double(x)) requires three times the memory compared with rowMedians(x). Currently, colMedians(x) is calling rowMedians(t(x)).

See Also

See rowMeans() in colSums().