plotrix (version 2.0.3)

color2D.matplot: Display a numeric matrix as color matrix

Description

Display the values of a numeric 2D matrix or data frame as colored rectangles.

Usage

color2D.matplot(x,redrange=c(0,1),greenrange=c(0,1),bluerange=c(0,1),
  show.legend=FALSE,xlab="Column",ylab="Row",...)

Arguments

x

data values

redrange, greenrange, bluerange

the ranges of red, green and blue that will be scaled to represent the range of numeric values

show.legend

whether to display a color range rectangle with the extreme numeric values in the lower left corner of the plot

xlab,ylab

axis labels for the plot.

...

arguments passed to plot.

Value

• nil

Details

Displays a plot with the same number of rectangular cells as there are numeric values in the matrix or data frame. Each rectangle is colored to represent its corresponding value. The rectangles are arranged in the conventional display of a 2D matrix with rows beginning at the top and columns at the left. The color scale defaults to black for the minimum value and white for the maximum. The function image performs almost the same when passed a matrix of values without grid positions, except that it assigns values to a finite list of colors rather than calculating a color for each distinct value.

See Also

color.scale, image

Examples

x<-matrix(rnorm(1024)+sin(seq(0,2*pi,length=1024)),nrow=32)
 color2D.matplot(x,c(1,0),c(0,0),c(0,1),show.legend=TRUE,
  xlab="Columns",ylab="Rows",main="2D matrix plot")