Gray Color Palette

Description

Create a vector of n gamma-corrected gray colors.

Usage

gray.colors(n, start = 0.3, end = 0.9, gamma = 2.2, alpha = NULL)
grey.colors(n, start = 0.3, end = 0.9, gamma = 2.2, alpha = NULL)

Arguments

Details

The function gray.colors chooses a series of n gamma-corrected gray levels between start and end: seq(start^gamma, end^gamma, length = n)^(1/gamma). The returned palette contains the corresponding gray colors. This palette is used in barplot.default.

grey.colors is an alias for gray.colors.

Value

A vector of n gray colors.

See Also

gray, rainbow, palette.

Examples

require(graphics)

pie(rep(1, 12), col = gray.colors(12))
barplot(1:12, col = gray.colors(12))

Results

R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
Copyright (C) 2016 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

> library(grDevices)
> png(filename="/home/ddbj/snapshot/RGM3/R_rel/result/grDevices/gray.colors.Rd_%03d_medium.png", width=480, height=480)
> ### Name: gray.colors
> ### Title: Gray Color Palette
> ### Aliases: gray.colors grey.colors
> ### Keywords: color
> 
> ### ** Examples
> 
> require(graphics)
> 
> pie(rep(1, 12), col = gray.colors(12))
> barplot(1:12, col = gray.colors(12))
> 
> 
> 
> 
> 
> dev.off()
null device 
          1 
>