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rggplot2themeslegend
Nathan Siemers
Nathan Siemers

Reputation: 433

R/ggplot2: figure legend for size has weird blobs covering sample data points

Surprised not to be able to find this here, I'm guessing this is a common problem.

I'm drawing boxplots in ggplot, plus plotting the data points themselves with geom_point() or geom_jitter(). When I set a size aesthetic for the points, the legend is obscured by dark blobs over the example data points.

library(ggplot2)
d = data.frame(
a = factor(c( rep('a',5), rep('b',5), rep('c',5) )), b = rnorm(15),
c = rnorm(15)
)
ggplot( aes( x = a, y = b, size = c), data = d ) + geom_boxplot(outlier.shape = NA) +
     geom_jitter(width = 0.3)

blobby size legends

Upvotes: 0

Views: 262

Answers (1)

Nathan Siemers
Nathan Siemers

Reputation: 433

Those blobs are coming from the size aesthetic getting applied to geom_boxplot(), leading to legend weirdness. The solution is to apply size aesthetics only to geom_point/jitter().

ggplot( aes( x = a, y = b), data = d ) + geom_boxplot(outlier.shape = NA) +
    geom_jitter( aes( size=c ), width = 0.3)

fixed legend

Upvotes: 2

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