R: Rich Color Palettes

rich.colors {gplots} | R Documentation

## Rich Color Palettes

### Description

Create a vector of `n` colors that are perceptually equidistant and in an order that is easy to interpret.

### Usage

    rich.colors(n, palette="temperature", alpha=1.0, rgb=FALSE, plot=FALSE)

### Arguments

`n` | number of colors to generate.
`palette` | palette to use: `"temperature"` contains blue-green-yellow-red, and `"blues"` contains black-blue-white.
`alpha` | alpha transparency, from 0 (fully transparent) to 1 (opaque).
`rgb` | if `TRUE` then a matrix of RGBA values is included as an attribute.
`plot` | whether to plot a descriptive color diagram.

### Value

A character vector of color codes.

### Author(s)

Arni Magnusson.

### See Also

`rgb`, `rainbow`, `heat.colors`.

### Examples

    m <- abs(matrix(1:120+rnorm(120), nrow=15, ncol=8))
    opar <- par(bg="gray", mfrow=c(1,2))
    matplot(m, type="l", lty=1, lwd=3, col=rich.colors(8))
    matplot(m, type="l", lty=1, lwd=3, col=rich.colors(8,"blues"))
    par(opar)

    barplot(rep(1,100), col=rich.colors(100), space=0, border=0, axes=FALSE)
    barplot(rep(1,20), col=rich.colors(40)[11:30]) # choose subset

    plot(m, rev(m), ylim=c(120,0), pch=16, cex=2,
         col=rich.colors(200,"blues",alpha=0.6)[1:120]) # semitransparent

    rich.colors(100, plot=TRUE)  # describe rgb recipe

    par(mfrow=c(2,2))
    barplot(m, col=heat.colors(15), main="\nheat.colors")
    barplot(m, col=1:15, main="\ndefault palette")
    barplot(m, col=rich.colors(15), main="\nrich.colors")
    barplot(m, col=rainbow(15), main="\nrainbow")
    par(opar)

[Package gplots version 3.0.1 Index]