rowMedians {matrixStats} | R Documentation |
Calculates the median for each row (column) in a matrix.
rowMedians(x, na.rm=FALSE, ...) colMedians(x, na.rm=FALSE, ...)
x |
A numeric NxK matrix . |
na.rm |
If TRUE , NA s are excluded first, otherwise not. |
... |
Not used. |
The implementation of rowMedians()
is optimized for both
speed and memory.
To avoid coercing to double
s (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))
.
Returns a numeric
vector
of length N (K).
Henrik Bengtsson (http://www.braju.com/R/)
See rowMeans()
in colSums
().