scale_colour_discrete not showing an example that uses the function

[stefanoborini]

scale_colour_discrete documentation

https://ggplot2.tidyverse.org/reference/scale_colour_discrete.html

does not show an actual example containing scale_colour discrete.

[yutannihilation]

As scale_colour_discrete() is the default discrete colour scale, the document shows what the user can do on the default scale. I don't think the documentation is bad. But, it might be nice if it can include how to use scale_colour_discrete() itself. Do you see any particular topic missing there?

[gavinsimpson]

The examples in the documentation are great if you understand how withr works and grok what's going on with the template function with all the embracing/NSE. The examples are more difficult than they need to be if you do understand these things. The examples are nigh-on-unusable if you don't.

All it needs is a simple example to start that shows actual code a normal user would write, e.g.

# temporarily change the scale to use the Okabe Ito palette
okabe <- c("#E69F00", "#56B4E9", "#009E73", "#F0E442",
    "#0072B2", "#D55E00", "#CC79A7")

ggplot(mpg, aes(cty, colour = class, fill = class)) +
    geom_density(alpha = 0.2) +
    scale_colour_discrete(type = okabe) +
    scale_fill_discrete(type = okabe)