color.gradient {plotrix} | R Documentation |
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.
color.gradient(reds,greens,blues,nslices=50)
reds,greens,blues |
vectors of the values of the color components as 0 to 1. |
nslices |
The number of color "slices". |
A vector of hexadecimal color values as used by col
.
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.
Jim Lemon
# 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))