Displaying empty sets.

[royfrancis]

Just wondering about how to handle empty sets.

In a scenario like this where z set is empty,

x <- data.frame(x=c(1,0,1,1,0),y=c(1,1,0,0,1),z=c(0,0,0,0,0))
x
  x y z
1 1 1 0
2 0 1 0
3 1 0 0
4 1 0 0
5 0 1 0

the plot shows

plot(euler(x))

which makes sense because z is empty. But, I was wondering if there might be a way to show in the plot that z is an option and it is empty.

[jolars]

I agree. It would be nice to show this somehow. Maybe not by default, but yes. I plan to look for a GSOC student for next year to work on eulerr, and this seems like a good addition.