How to write a variable to avoid dollar sign notation in ggplot aes()

Question

I am trying to set a factor variable that gets called multiple times in a ggplot (e.g., color, factor). I have multiple variables I would like to factor by, and would like to avoid copying my code, and replacing that variable 4 times. If I wasn't plotting I would just use set the variable to

split <- data$npantc_quantile

and substitute it everywhere it appears.

gg_antc_q <- ggplot(data=filter(data, npantc_quantile %in% c(1, 5)),aes(x=delta,y=1-user_response, colour = npantc_quantile, group = npantc_quantile))+
  stat_summary(fun.data = "mean_cl_boot", geom = "point", aes(shape = factor(npantc_quantile)), size = 4)+
  stat_summary(fun.data = "mean_cl_boot", geom = "line")+
  geom_smooth() +
  ggtitle("Quantile Split: Arrows Normal") +
  add_tone_lag_450

However, I know that I need to avoid dollar sign notation when calling anything inside aes(). How else could I call this split without having to rewrite it 4 times?

Would bracket notation solve the problem? `data['npantc_quantile']` ? — Ryan, Oct 30 '19 at 21:00
If you have a `colour=`, you shouldn't need a `group=` if it's the same variable. With ggplot/dplyr, you could set `split — MrFlick, Oct 30 '19 at 21:00
@Ryan. No. Using bracket notation causes the same problem as `$` inside `aes()` -- you need to have the symbols separate from the data source to work properly. — MrFlick, Oct 30 '19 at 21:01
See also the FAQ on [how to use variables to specify columns in ggplot](https://stackoverflow.com/q/22309285/903061) — Gregor Thomas, Oct 31 '19 at 14:51

score 0 · Answer 1 · answered Oct 31 '19 at 14:46

0

Using split<- expr(npantc_quantile) with !!split worked to fix my problem. I also removed the group = !!split as it was redundant. Thanks for the suggestion MrFlick

answered Oct 31 '19 at 14:46

Sean McWeeny

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How to write a variable to avoid dollar sign notation in ggplot aes()

1 Answers1