aes: Generate aesthetic mappings that describe how variables in the data are
mapped to visual properties (aesthetics) of geoms.
Description
aes creates a list of unevaluated expressions. This function also
performs partial name matching, converts color to colour, and old style R
names to ggplot names (eg. pch to shape, cex to size)
Usage
aes(x, y, ...)
Arguments
x,y,...
List of name value pairs giving aesthetics to map.