Utilities for plotting with a continuous color scale

jet.colors and hot.colors create a color table useful for contiguous color scales and scolor assigns colors to a numerical vector.

Usage

scolor(s, col = jet.colors(128), slim = range(s, finite = TRUE))

jet.colors(n)

hot.colors(n, rev = TRUE)

Arguments

s

values to be converted to the color scale.

col

color table used to set up the color scale (see image for details).

slim

limits used to set up the color scale.

n

number of colors (>= 1) to be in the palette.

rev

logical; if TRUE, the palette is reversed (decreasing overall luminosity).

Value

scolor, jet.colors and hot.colors return a character vector of colors.

Details

scolor converts a real valued vector to a color scale. The range slim is divided into length(col) + 1 pieces of equal length. Values which fall outside the range of the scale are coded as NA.

jet.colors generates a rainbow style color table similar to the MATLAB (TM) jet color scheme. It may be appropriate to distinguish between values above and below a central value (e.g. between positive and negative values).

hot.colors generates a color table similar to the MATLAB (TM) hot color scheme (reversed by default). It may be appropriate to represent values ranging from 0 to some maximum level (e.g. density estimation). The default value rev = TRUE may be adequate to grayscale conversion.

See also

heat.colors, terrain.colors, rgb.