Change the order of discrete axis.

Generate a factor with reversed levels or use a new ggplot2 option.

Examples.

df$X1 = with(df, factor(X1, levels = rev(levels(X1))))

http://stackoverflow.com/questions/7418191/sorting-dotplot-factor-axis-in-ggplot

  1. Reverse the order of a discrete-valued axis
  2. Get the levels of the factor
flevels <- levels(PlantGrowth$group)
  1. "ctrl" "trt1" "trt2"
  2. Reverse the order
flevels <- rev(flevels)
  1. "trt2" "trt1" "ctrl"
bp + scale_x_discrete(limits=flevels)

http://www.cookbook-r.com/Graphs/Axes_(ggplot2)/#reversing-the-direction-of-an-axis

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