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I would like to save some specifications of a ggplot command for later, given that I need to run several different graphs that all share some scale aesthetics.
Let's say I would like save this for later:
my.scale_aes <- scale_x_continuous(...) + scale_color_manual(...) This would of course prompt an error message, indicating that you cannot add ggproto objects together without a direct ggplot() call. But is that really the case? And is there another way by which I could still add these components together?
I read somewhere else that it has to do with the different methods of adding elements together: methods("+") and that what I need has something to do with +.gg* but I have no idea how to implement this and how to make it work.
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Elements that are normally added to a ggplot with operator + , such as scales, themes, aesthetics can be replaced with the %+% operator.
One error you may encounter in R is: Error: Cannot add ggproto objects together. Did you forget to add this object to a ggplot object? This error typically occurs when you attempt to create a visualization using the ggplot2 package but forget to add a plus (+) sign somewhere in the syntax.
ggproto implements a protype based OO system which blurs the lines between classes and instances. It is inspired by the proto package, but it has some important differences. Notably, it cleanly supports cross-package inheritance, and has faster performance.
Geoms. A layer combines data, aesthetic mapping, a geom (geometric object), a stat (statistical transformation), and a position adjustment. Typically, you will create layers using a geom_ function, overriding the default position and stat if needed.
You can do this by defining a list of the ggplot terms you want and adding them in.
library(ggplot2) my.scale_aes <- list( scale_x_continuous(breaks = c(56, 60, 61)), scale_color_manual(values = c("black", "red")) ) ggplot(data = diamonds[1:100,], aes(depth, price, color = cut == "Ideal")) + geom_point() + my.scale_aes 
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