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Unable to use fixed alpha aesthetic when color is mapped to a factor #1932

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logworthy opened this issue Nov 29, 2016 · 2 comments
Closed

Unable to use fixed alpha aesthetic when color is mapped to a factor #1932

logworthy opened this issue Nov 29, 2016 · 2 comments
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@logworthy
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@logworthy logworthy commented Nov 29, 2016

I'm trying to use a fixed alpha aesthetic to manually highlight points in a plot. It fails when color is mapped to a factor.

library(ggplot2)
data(mtcars)

# fails (but should work)
ggplot(mtcars, aes(x=disp, y=hp, color=as.factor(cyl)))+geom_point(alpha=seq(0,1,length.out=32))
# Error: Aesthetics must be either length 1 or the same as the data (3): alpha

# fails (and should fail)
ggplot(mtcars, aes(x=disp, y=hp, color=as.factor(cyl)))+geom_point(alpha=seq(0,1,length.out=3))
# Error: Aesthetics must be either length 1 or the same as the data (32): alpha

# succeeds
ggplot(mtcars, aes(x=disp, y=hp, color=cyl))+geom_point(alpha=seq(0,1,length.out=32))

Tested on version 2.2.0

@hadley hadley added the bug label Jan 25, 2017
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@hadley hadley commented Jan 25, 2017

This was a tricky one - it turns out the problem was with the legend.

@hadley hadley closed this in 0b57d83 Jan 25, 2017
@logworthy
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@logworthy logworthy commented Jan 25, 2017

Thanks!

pkq added a commit to pkq/ggplot2 that referenced this issue May 15, 2018
Reverse inadvertent deletion of 'not' in 'aesthetics that are not length one'
pkq added a commit to pkq/ggplot2 that referenced this issue May 15, 2018
Reverse inadvertent deletion of 'not' in 'aesthetics that are not length one'
hadley added a commit that referenced this issue May 15, 2018
Reverse inadvertent deletion of 'not' in 'aesthetics that are not length one'
@lock lock bot locked as resolved and limited conversation to collaborators Jun 19, 2018
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