Define aesthetic mappings programatically

Aesthetic mappings describe how variables in the data are mapped to visual properties (aesthetics) of geoms. aes uses non-standard evaluation to capture the variable names. aes_ and aes_string require you to explicitly quote the inputs either with "" for aes_string(), or with quote or ~ for aes_(). (aes_q is an alias to aes_). This makes aes_ and aes_string easy to program with.

aes_(x, y, ...)
aes_string(x, y, ...)
aes_q(x, y, ...)
x, y, ...
List of name value pairs. Elements must be either quoted calls, strings, one-sided formulas or constants.

aes_string and aes_ are particularly useful when writing functions that create plots because you can use strings or quoted names/calls to define the aesthetic mappings, rather than having to use substitute to generate a call to aes().

I recommend using aes_(), because creating the equivalents of aes(colour = "my colour") or aes{x = `X$1`} with aes_string() is quite clunky.

See Also


  • aes_
  • aes_string
  • aes_q
library(ggplot2) # Three ways of generating the same aesthetics aes(mpg, wt, col = cyl) aes_(quote(mpg), quote(wt), col = quote(cyl)) aes_(~mpg, ~wt, col = ~cyl) aes_string("mpg", "wt", col = "cyl") # You can't easily mimic these calls with aes_string aes(`$100`, colour = "smooth") aes_(~ `$100`, colour = "smooth") # Ok, you can, but it requires a _lot_ of quotes aes_string("`$100`", colour = '"smooth"') # Convert strings to names with var <- "cyl" aes(col = x) aes_(col =
Documentation reproduced from package ggplot2, version 2.2.1, License: GPL-2 | file LICENSE

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