How do I reverse the Y axis in ggplot's geom_tile?

Question

Below is a graph. How do I reverse the Y axis , so it reads down "a b" instead of "b a", while leaving the X axis alone?

Code:

library(ggplot2) levels = ordered(c('a', 'b')) data = data.frame(x=ordered(c('a', 'a', 'b', 'b'), levels=levels), y=ordered(c('a', 'b', 'a', 'b'), levels=levels), prob=c(0.3, 0.7, 0.4, 0.6)) ggplot(data, aes(x, y)) + geom_tile(aes(fill=prob))

ggplot(data, aes(x, forcats::fct_rev(y))) + geom_tile(aes(fill=prob)) — Axeman
– Axeman, Commented Nov 21, 2016 at 21:07

dfrankow · Accepted Answer · 2021-02-14 13:51:40Z

10

I figured this out.

ggplot(data, aes(x, ordered(y, levels=rev(levels)))) + geom_tile(aes(fill=prob))

edited Feb 14, 2021 at 13:51

answered Nov 21, 2016 at 19:00

dfrankow

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