Sequential grey colour scale.

Usage

scale_colour_grey(..., start = 0.2, end = 0.8, na.value = "red")

scale_fill_grey(..., start = 0.2, end = 0.8, na.value = "grey50")

scale_color_grey(..., start = 0.2, end = 0.8, na.value = "red")

Arguments

start

gray value at low end of palette

end

gray value at high end of palette

...

Other arguments passed on to discrete_scale to control name, limits, breaks, labels and so forth.

na.value

Colour to use for missing values

Examples

p <- qplot(mpg, wt, data=mtcars, colour=factor(cyl))
p + scale_colour_grey()


p + scale_colour_grey(end = 0)



# You may want to turn off the pale grey background with this scale
p + scale_colour_grey() + theme_bw()



# Colour of missing values is controlled with na.value:
miss <- factor(sample(c(NA, 1:5), nrow(mtcars), rep = TRUE))
qplot(mpg, wt, data = mtcars, colour = miss) + scale_colour_grey()


qplot(mpg, wt, data = mtcars, colour = miss) +
  scale_colour_grey(na.value = "green")

See also