reverse "Orange-Blue Diverging" or "Orange-Blue-White Diverging"

[fissehab]

Is it possible to reverse the Orange-Blue Diverging or Orange-Blue-White Diverging palettes in scale_color_gradient2_tableau?

[jrnold]

You can set trans = "reverse" to reverse the scale.

df <- data.frame(
  x = runif(100),
  y = runif(100),
  z1 = rnorm(100),
  z2 = abs(rnorm(100))
)
p <- ggplot(df, aes(x, y)) + geom_point(aes(colour = z2))

p + scale_colour_gradient2_tableau() + ggtitle("Original")
p + scale_colour_gradient2_tableau(trans = "reverse") + ggtitle("Reversed")