r - What is the meaning of dot dot in this ggplot expression? -


this question has answer here:

i found expression while working on ggplot. 

qplot(carat, ..density.., data = diamonds, facets = color ~ ., geom = "histogram", binwidth = 0.1, xlim = c(0, 3))

how ..density.. interpreted r?

clearly not variable , processed inside function convey want use density undertand how works @ language level.

normally, aesthetics 1:1 mapping column in input data.frame. in case, density output of binning histogram. so, ggplot2 way of referring derivatives product of aggregation, such binning histogram in case.


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