r - "Nested" barplots, with multiple levels of grouping -


how can group bars in barplot third variable?

enter image description here

i achieve in base r, without, example, ggplot2, in this related question. in another related question groups of groups labeled, not (visually) grouped – in example above –, making plot difficult read.

sample data:

groups = c("a", "b") choices = c("orange", "apple", "beer") supergroups = c("fruits", "non-fruits") dat <- data.frame(     group = rep(groups, c(93, 94)),     choice = factor(c(             rep(choices, c(51, 30, 12)),             rep(choices, c(47, 29, 18))         ),         levels = choices     ),     supergroup = c(         rep(supergroups, c(81, 12)),         rep(supergroups, c(76, 18))     ) ) barplot(table(dat), beside = true)

which returns error:

error in barplot.default(table(dat), beside = true) :    'height' must vector or matrix


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