`geom_beeswarm` returns error with one point and `priority = "density"`

[MarekGierlinski]

Though ggbeeswarm is not designed to plot a single point, it should handle it with no errors. Here is a reprex, which generates an error:

library(ggplot2)
library(ggbeeswarm)

df <- data.frame(x = 1, y = 1)

ggplot(df, aes(x = x, y = y)) + geom_beeswarm(priority = "density")
#> Error in `geom_beeswarm()`:
#> ! Problem while computing position.
#> ℹ Error occurred in the 1st layer.
#> Caused by error in `density.default()`:
#> ! need at least 2 points to select a bandwidth automatically

This only happens when priority = "density", other priorities are handled correctly.

[eli-daniels]

There is a similar error in geom_quasirandom when using incomplete data. While it's not a big issue when coding interactively, it's problematic in programmatic applications.

library(ggplot2)
library(ggbeeswarm)

df <- data.frame(
  x = c("A", "A", "B", "B"), y = c(1, NaN, 2, Inf))

ggplot(df, aes(x = x, y = y, color = x)) + geom_quasirandom()
# Error in geom_quasirandom() : Problem while computing position.
# ℹ Error occurred in the 1st layer.
# Caused by error in `density.default()`:
#   ! need at least 2 points to select a bandwidth automatically