Setting Defaults for geoms and scales ggplot2

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There is another method for this now. You can essentially overwrite any aesthetics scale, for example: 

scale_colour_discrete <- function(...) scale_colour_brewer(..., palette="Set2")
scale_fill_discrete <- function(...) scale_fill_brewer(... , palette="Set2")

Now, your aesthetics will be coloured or filled following that behaviour.’

As per: https://groups.google.com/forum/?fromgroups=#!topic/ggplot2/w0Tl0T_U9dI

With respect to defaults to geoms, you can use update_geom_defaults, for example: 

update_geom_defaults("line",   list(size = 2))

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