ColorBar {GLAD} | R Documentation

## Calibration bar for color images

### Description

This function produces a color image (color bar) which can be used for the legend to another color image obtained from the functions `image` or `arrayPlot`.

### Usage

    ColorBar(x, horizontal=TRUE, col=heat.colors(50), scale=1:length(x), k=10, ...)

### Arguments

`x` | If "numeric", a vector containing the "z" values in the color image, i.e., the values which are represented in the color image. Otherwise, a "character" vector representing colors.
`horizontal` | If `TRUE`, the values of `x` are represented as vertical color strips in the image, else, the values are represented as horizontal color strips.
`col` | Vector of colors such as that generated by rainbow, heat.colors, topo.colors, terrain.colors, or similar functions. In addition to these color palette functions, a new function `myPalette` was defined to generate color palettes from user supplied low, middle, and high color values.
`scale` | A "numeric" vector specifying the "z" values in the color image. This is used when the argument `x` is a "character" vector representing color information.
`k` | Object of class "numeric", for the number of labels displayed on the bar.
`...` | Optional graphical parameters, see `par`.

### Author(s)

Sandrine Dudoit, Yee Hwa (Jean) Yang.

### See Also

`image`, `arrayPlot` `myPalette`.

### Examples

    par(mfrow=c(3,1))
    Rcol <- myPalette(low="white", high="red", k=10)
    Gcol <- myPalette(low="white", high="green", k=50)
    RGcol <- myPalette(low="green", high="red", k=100)
    ColorBar(Rcol)
    ColorBar(Gcol, scale=c(-5,5))
    ColorBar(1:50, col=RGcol)

    par(mfrow=c(1,3))
    x<-seq(-1, 1, by=0.01)
    ColorBar(x, col=Gcol, horizontal=FALSE, k=11)
    ColorBar(x, col=Gcol, horizontal=FALSE, k=21)
    ColorBar(x, col=Gcol, horizontal=FALSE, k=51)

[Package GLAD version 2.56.0 Index]