ColorBar {GLAD}R Documentation

Calibration bar for color images


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.


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


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.


Sandrine Dudoit, Yee Hwa (Jean) Yang.

See Also

image, arrayPlot myPalette.


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(Gcol, scale=c(-5,5))
ColorBar(1:50, col=RGcol)

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 1.0.1 Index]