clean up the data objects in examples?

[yihui]

e.g. a new data object movies was created in the example of geom_histogram, and it can cause problems if we continue to run the examples of geom_violin:

library(ggplot2)
example('geom_histogram', ask = FALSE)
example('geom_violin', ask = FALSE)

gm_vln> m <- ggplot(movies, aes(y = votes, x = rating,
gm_vln+    group = round_any(rating, 0.5)))

gm_vln> m + geom_violin()
Error in `$<-.data.frame`(`*tmp*`, "n", value = 3L) : 
  replacement has 1 row, data has 0

gm_vln> m + geom_violin() + scale_y_log10()
Error in `$<-.data.frame`(`*tmp*`, "n", value = 3L) : 
  replacement has 1 row, data has 0

gm_vln> m + geom_violin() + coord_trans(y = "log10")
Error in `$<-.data.frame`(`*tmp*`, "n", value = 3L) : 
  replacement has 1 row, data has 0
Error in log(x, base) : non-numeric argument to mathematical function

It seems the first three errors were in try(), so there is no way to trace them back; it might be an environment/variable scope problem. I do not know.

[statwonk]

I've been having this issue with geom_violin and I can't figure it out.

ggplot(aes(x = title, y = percent_watched), data = df) +
+ geom_violin()
Error in `$<-.data.frame`(`*tmp*`, "n", value = 5L) : 
  replacement has 1 row, data has 0

Where title is a factor of strings and percent_watched is a num. geom_boxplot works just fine.

[hadley]

@cpeter9 I don't think that's related to this issue - please ask about on the mailing list, or file a separate issue with a reproducible example.

[stevehoang]

@statwonk I am having the same issue. Did you find a solution?

[hadley]

@statwonk @sah9b That's not related to this issue - please ask about on the mailing list, or file a separate issue with a reproducible example.

[hadley]

That sounds like a great feature, but unfortunately we don't currently have the development bandwidth to support it. If you'd like to submit a pull request that implements this feature, please follow the instructions in the development vignette.