ggvis - add tooltip with count to layer_bars -


suppose have following graph

library(ggvis) mtcars%>% ggvis(~factor(cyl)) %>% layer_bars()

how can add tooltip count variable?

thanks

this trick:

library(ggvis) mtcars  %>% ggvis(~factor(cyl)) %>% layer_bars() %>%   add_tooltip(function(df) (df$stack_upr_ - df$stack_lwr_))

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