scale_colour_gradientn

0th

Percentile

Smooth colour gradient between n colours

Smooth colour gradient between n colours

Usage
scale_colour_gradientn(..., colours, values = NULL,
    space = "Lab", na.value = "grey50",
    guide = "colourbar")

scale_fill_gradientn(..., colours, values = NULL, space = "Lab", na.value = "grey50", guide = "colourbar")

scale_color_gradientn(..., colours, values = NULL, space = "Lab", na.value = "grey50", guide = "colourbar")

Arguments
guide
Type of legend. Use "colourbar" for continuous colour bar, or "legend" for discrete colour legend.
colours
vector of colours
values
if colours should not be evenly positioned along the gradient this vector gives the position (between 0 and 1) for each colour in the colours vector. See rescale for a convience functio
space
colour space in which to calculate gradient. "Lab" usually best unless gradient goes through white.
...
Other arguments passed on to discrete_scale to control name, limits, breaks, labels and so forth.
na.value
Colour to use for missing values
See Also

Other colour scales: scale_color_brewer, scale_color_continuous, scale_color_discrete, scale_color_gradient, scale_color_gradient2, scale_color_grey, scale_color_hue, scale_colour_brewer, scale_colour_continuous, scale_colour_discrete, scale_colour_gradient, scale_colour_gradient2, scale_colour_grey, scale_colour_hue, scale_fill_brewer, scale_fill_continuous, scale_fill_discrete, scale_fill_gradient, scale_fill_gradient2, scale_fill_grey, scale_fill_hue

Aliases
  • scale_color_gradientn
  • scale_colour_gradientn
  • scale_fill_gradientn
Examples
# scale_colour_gradient make it easy to use existing colour palettes

dsub <- subset(diamonds, x > 5 & x < 6 & y > 5 & y < 6)
dsub$diff <- with(dsub, sqrt(abs(x-y))* sign(x-y))
(d <- qplot(x, y, data=dsub, colour=diff))

d + scale_colour_gradientn(colours = rainbow(7))
breaks <- c(-0.5, 0, 0.5)
d + scale_colour_gradientn(colours = rainbow(7),
  breaks = breaks, labels = format(breaks))

d + scale_colour_gradientn(colours = topo.colors(10))
d + scale_colour_gradientn(colours = terrain.colors(10))

# You can force them to be symmetric by supplying a vector of
# values, and turning rescaling off
max_val <- max(abs(dsub$diff))
values <- seq(-max_val, max_val, length = 11)

d + scale_colour_gradientn(colours = topo.colors(10),
  values = values, rescaler = function(x, ...) x, oob = identity)
d + scale_colour_gradientn(colours = terrain.colors(10),
  values = values, rescaler = function(x, ...) x, oob = identity)
Documentation reproduced from package ggplot2, version 0.9.3.1, License: GPL-2

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