Gets an order statistic for each row (column) in a matrix.
rowOrderStats(x, rows = NULL, cols = NULL, which, dim. = dim(x), ...,
useNames = TRUE)colOrderStats(x, rows = NULL, cols = NULL, which, dim. = dim(x), ...,
useNames = TRUE)
Returns a numeric
vector
of
length N (K).
A vector
indicating subset of rows to
operate over. If NULL
, no subsetting is done.
A vector
indicating subset of columns to
operate over. If NULL
, no subsetting is done.
An integer
index in [1,K] ([1,N])
indicating which order statistic to be returned.
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.
If TRUE
(default), names
attributes of the result are set, otherwise not.
This method does not handle missing values,
that is, the result corresponds to having na.rm = FALSE
(if such an
argument would be available).
The native implementation of rowOrderStats()
was adopted by
Henrik Bengtsson from Robert Gentleman's rowQ()
in the Biobase
package.
The implementation of rowOrderStats()
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.
See rowMeans()
in colSums
().