How many type of colors in a palette.

[EconKid]

I do some research on this topic.

1. use the package wesanderson, I can run this script to get how many type of colors in a palette.

library(wesanderson)
library(magrittr)
wes_palette("Royal1") %>% length
#> [1] 4

^{Created on 2019-03-21 by the reprex package (v0.2.1)}

1. However, I don't how to do it for the function scale_fill_brewer, the fastest way now for me is to check this picture from Cookbook for R and count it.

library(RColorBrewer)
display.brewer.all()

[chris.prener]

The brewer.pal.info object has all the detail you want. If you wanted a process for narrowing it down, you could do something like:

# dependencies
suppressMessages(library(dplyr)) 
library(tibble)
library(RColorBrewer)

# displacy a single item
brewer.pal.info %>%
  rownames_to_column(var = "name") %>%
  filter(name == "OrRd")
#>   name maxcolors category colorblind
#> 1 OrRd         9      seq       TRUE

^{Created on 2019-03-20 by the reprex package (v0.2.1)}

[EconKid]

Hi @chris.prener, thanks for your quick solution.

brewer.pal.info is cool and really useful. And your analysis to narrow it down is inspirational.

brewer.pal.info %>% 
   rownames_to_column('color') %>% 
   ggplot(aes(fct_reorder(color,maxcolors), maxcolors)) +
   geom_col() +
   coord_flip()