[R] getting 21 very different colours

S Ellison S@E|||@on @end|ng |rom LGCGroup@com
Tue Sep 11 12:08:25 CEST 2018

You could look at combning a number of palettes from the RColorBrewer package to get the palette length you want.

S Ellison

> -----Original Message-----
> From: R-help [mailto:r-help-bounces using r-project.org] On Behalf Of Federico
> Calboli
> Sent: 11 September 2018 08:35
> To: r-help using r-project.org
> Subject: [R] getting 21 very different colours
> Hi All,
> I am plotting a scatterplot of 21 populations, and I am using
> rainbow(21)[pops.col] to generate 21 colours for the plot (which works).
> Maybe it is because I can really process few colours at a time, but the
> differences between the colours are not as strong as I’d like.  I can specify
> start and end for rainbow(), but if anything that looks worse if I do not just
> stick to 0 and 1.
> Is there a way of getting a set of 21 colours that maximises the differences
> between them?
> I could pick them by hand, but that is about 15 colours more than I know (I
> have a detailed colourchart, but the visual differences between ’skyblue’ and
> ’slategrey’ elude me when plotted as dots on a plot).
> Cheers
> F
> --
> Federico Calboli
> LBEG - Laboratory of Biodiversity and Evolutionary Genomics
> Charles Deberiotstraat 32 box 2439
> 3000 Leuven
> +32 16 32 87 67
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