spatialEco (version 2.0-2)

all_pairwise: All pairwise combinations

Description

Creates all pairwise combinations list for iteration

Usage

all_pairwise(x)

Value

A list object with increasing all combination objects, the first list element are the pairwise comparisons

Arguments

x

A numeric or character vector

Author

Jeffrey S. Evans <jeffrey_evans<at>tnc.org>

Details

This returns a list of vector combinations starting with pairwise, as the first nested list element, then in groups of threes, fours, to length of the vector.

Examples

classes <- paste0("class", 1:10)

all_pairwise(classes)[[1]]

#### How to use as an iterator
# dataframe with 4 cols, 100 rows
d <- as.data.frame(matrix(runif(100*4), 100, 4)) 
  names(d) <- paste0("class", 1:4) 

( idx <- all_pairwise(colnames(d))[[1]] ) 

opar <- par(no.readonly=TRUE)
  par(mfrow=c(2,3))
    lapply(idx, function(i) {
      plot(d[,i[1]], d[,i[2]], main=paste0(i[1], " vs ", i[2]) )
    })	
par(opar)