Yes, it is silly to have single group venn. But it makes sense when working with shinyapps. For example when we want to select/deselect from list of groups to plot.
Say we have 10 groups in checkboxGroupInput, and we preselect 1,2,3 as a default, then user unticks 1,2, (now we have only 1 group and get error), and wants to tick group 5 and 6.
Yes, it is silly to have single group venn. But it makes sense when working with shinyapps. For example when we want to select/deselect from list of groups to plot.
Say we have 10 groups in
checkboxGroupInput, and we preselect1,2,3as a default, then user unticks1,2, (now we have only 1 group and get error), and wants to tick group 5 and 6.