hsv {grDevices} | R Documentation |
Create a vector of colors from vectors specifying hue, saturation and value.
hsv(h = 1, s = 1, v = 1, alpha)
h,s,v |
numeric vectors of values in the range |
alpha |
numeric vector of values in the range |
Semi-transparent colors (0 < alpha < 1
) are supported only on
some devices: see rgb
.
This function creates a vector of colors corresponding to the
given values in HSV space. The values returned by hsv
can be
used with a col=
specification in graphics functions or in
par
.
hcl
for a perceptually based version of hsv()
,
rgb
and rgb2hsv
for RGB to HSV conversion;
rainbow
,
gray
.
require(graphics)
hsv(.5,.5,.5)
## Red tones:
n <- 20; y <- -sin(3*pi*((1:n)-1/2)/n)
op <- par(mar = rep(1.5, 4))
plot(y, axes = FALSE, frame.plot = TRUE,
xlab = "", ylab = "", pch = 21, cex = 30,
bg = rainbow(n, start = .85, end = .1),
main = "Red tones")
par(op)