color.gradient: Calculate an arbitrary sequence of colors

Description Usage Arguments Value Note Author(s) See Also Examples

View source: R/color.gradient.R

Description

color.gradient is now just a call to color.scale with a vector of equally spaced integers (1:nslices). The function is kept for backward compatibility.

Usage

1
 color.gradient(reds,greens,blues,nslices=50)

Arguments

reds,greens,blues

vectors of the values of the color components as 0 to 1.

nslices

The number of color "slices".

Value

A vector of hexadecimal color values as used by col.

Note

The function is mainly useful for defining a set of colors to represent a known number of gradations. Such a set can be used to assign a grade to a small number of values (e.g. points on a scatterplot - but see color.scale for large numbers) and display a color bar using gradient.rect as a legend.

Author(s)

Jim Lemon

See Also

rescale,approx,color.scale

Examples

1
2
 # try it with red and blue endpoints and green midpoints.
 color.gradient(c(0,1),c(1,0.6,0.4,0.3,0),c(0.1,0.6))

plotrix/plotrix documentation built on Jan. 23, 2020, 1:38 p.m.