GetColor {geneplotter} | R Documentation

## 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)

[Package geneplotter version 1.5.4 Index]