Hi Ross,
If you really need 15 colors, maybe you can use the Set3 palette
provided by RColorBrewer (this is the one used by TraMineR up to 12
states) and add yourself 3 more colors ?
For example (you can mix the hexadecimal color numbers from the
RColorBrewer palette and real color names in the same vector) :
library(RColorBrewer)
mycolors <- brewer.pal(12,"Set3")
mycolors <- c(mycolors, "blue", "green", "yellow")
All the best,
Alexis.
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