R: Draw a color-coded triangular distance matrix

distogram {squash}

R Documentation

Draw a color-coded triangular distance matrix

Description

This function draws a color-coded, rotated triangular matrix indicating the "distance" between every pair of items.

Usage

distogram(x, map, 
  n = 10, base = NA, colFn = heat, 
  key = TRUE,  title = NA, ...)

Arguments

`x`	A `dist` object, or a square numeric matrix.
`map`	A color map, as generated by `makecmap` (optional).
`n, base, colFn`	Arguments passed to `makecmap`, if `map` is omitted.
`key`	Add a color key?
`title`	Title for the color key.
`...`	Further arguments passed to `trianglegram`, (e.g. `labels`).

Details

If the input x is a matrix, the lower triangle is extracted by default (but see the arguments for trianglegram).

Value

The color map, invisibly.

Examples

 
  ## Distances between European cities
  distogram(eurodist, title = 'Distance (km)')  

  ## Some variations
  map <- distogram(eurodist, key = FALSE, colFn = jet, right = TRUE)  
  vkey(map, title = 'Distance (km)', x = -8)

[Package squash version 1.0.8 Index]