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Computation failed in `stat_function()` for non-numeric values of x #1509

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atfg opened this Issue Jan 20, 2016 · 1 comment

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@atfg

atfg commented Jan 20, 2016

Drawing a line with stat_function for x as factor used to work in ggplot2_1.0.0 and ggplot2_1.0.1. Doesn't work in ggplot2_2.0.0:

ggplot(iris,aes(x=factor(Species),Petal.Length)) + geom_violin() + stat_function(fun=function (x) as.numeric(x)^2, colour="red")

This works in ggplot2_2.0.0, but the x labels need fixing:

ggplot(iris,aes(x=as.numeric(Species),Petal.Length,group=as.numeric(Species))) + geom_violin() + stat_function(fun=function (x) as.numeric(x)^2, colour="red")
@klmr

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klmr commented Jan 20, 2016

It’s worth noting that the x labels cannot be fixed by adding a scale_x_discrete — this will result in the same error as when passing a categorical variabel to the function.

However, using a scale_x_continuous works:

ggplot(iris) +
    aes(as.numeric(Species), Petal.Length, group = Species) +
    geom_violin() +
    stat_function(fun = function (x) as.numeric(x) ^ 2, color = "red") +
    scale_x_continuous('Species',
                       breaks = seq_len(nlevels(iris$Species)),
                       labels = levels(iris$Species))

@hadley hadley changed the title from breaking change - Computation failed in `stat_function()` for non-numeric values of x to Computation failed in `stat_function()` for non-numeric values of x Jan 22, 2016

@hadley hadley closed this in 0ce1c74 Jan 23, 2016

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