GetColor: A function to get the Red-Blue color scheme used by dChip

In Bioconductor/geneplotter: Graphics related functions for Bioconductor

A function to get the Red-Blue color scheme used by dChip

Description

A simple, vectorized function that computes a Red/Blue color for plotting microarray expression data.

Usage

GetColor(value, GreenRed=FALSE, DisplayRange=3)
dChip.colors(n)
greenred.colors(n)

Arguments

value	The vector of expression values.
GreenRed	If TRUE the Green-Red colors are produced, otherwise Red-Blue are procduced.
DisplayRange	A parameter controlling the range of value's that will be plotted.
n	An integer saying how many colors to be in the palette.

Details

GetColor is a simple mapping into RGB land provided by Cheng Li. dChip.colors provides functionality similar to that of topo.colors for the red–blue colors used for genome plots. greenred.colors does the same for the green-black-red gradient.

Value

A vector of RGB colors suitable for plotting in R.

Author(s)

R. Gentleman, based on an original by C. Li.

Examples

  set.seed(10)
  x <- rnorm(10)
  GetColor(x)
  dChip.colors(10)

Bioconductor/geneplotter documentation built on Nov. 2, 2024, 7:25 a.m.