rowOrderStats: Gets an order statistic for each row (column) in a matrix

Description

Gets an order statistic for each row (column) in a matrix.

Usage

rowOrderStats(x, rows = NULL, cols = NULL, which, dim. = dim(x), ...,
  useNames = TRUE)
colOrderStats(x, rows = NULL, cols = NULL, which, 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.
which: An integer index in [1,K] ([1,N]) indicating which order statistic to be returned.
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.

Missing values

This method does not handle missing values, that is, the result corresponds to having na.rm = FALSE (if such an argument would be available).

Author

The native implementation of rowOrderStats() was adopted by Henrik Bengtsson from Robert Gentleman's rowQ() in the Biobase package.

Details

The implementation of rowOrderStats() is optimized for both speed and memory. To avoid coercing to doubles (and hence memory allocation), there is a unique implementation for integer matrices.