Feature request: Include empty sets

[maia-sh]

I would like to include an empty set in an UpSet plot. I see #38 on the inclusion of empty intersections, but I've not managed to include an empty set.
Is this currently possible and if so how?

[const-ae]

Hi Maia,

this sounds like a reasonable feature. Unfortunately, I don't think I have implemented an option for it.

The problem is that I am specifically filtering out empty sets here https://github.com/const-ae/ggupset/blob/master/R/scale_upset.R#L192.

If I replace that line with sets <- self$sets, I can make the following plot:

However, I will not make this change, as I am not really actively working on this repo and don't know what kind of unintended consequences this change might have. Sorry.

Depending how much you want this feature, I recommend cloning this repo and making the change yourself.

Best,
Constantin

[const-ae]

This is the code I used to generate the plot, after changing line 192:

  tidy_movies %>%
    distinct(title, year, length, .keep_all=TRUE) %>%
    ggplot(aes(x=Genres)) +
    geom_bar() +
    scale_x_upset(n_intersections = 20, sets = c("Comedy", "Action", "Empty set"))