pairwise: Apply a function to pairwise of all combinations in row or...

In byzheng/myutils: My utility functions for R

Apply a function to pairwise of all combinations in row or column of a matrix.

Description

Apply a function to pairwise of all combinations in row or column of a matrix.

Usage

pairwise(X, margin = c(1, 2), FUN, ...)

Arguments

X	a matrix
margin	row (1) or column (2) to apply the function
FUN	the function to be applied, which has two arguments and only returns a single value.
...	optional arguments to FUN

Value

a matrix with the same number of row (margin = 1) or column (margin = 2) with the original matrix.

Examples

X <- matrix(c(1, 2, 3, 4,
              1, 2, 5, 6,
              1, 2, 5, 7), nrow = 4)
FUN <- function(x, y, na.rm = FALSE) {
   sum(x != y, na.rm = na.rm)
}
pairwise(X, 2, FUN, na.rm = TRUE)

byzheng/myutils documentation built on Oct. 3, 2024, 1:35 a.m.