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This is the default R palette, to be able to reproduce the colors of older igraph versions. Its colors are appropriate for categories, but they are not very attractive.
r_pal(n)
The number of colors to use, the maximum is eight.
A character vector of color names.
Other palettes: categorical_pal; diverging_pal; sequential_pal
categorical_pal
diverging_pal
sequential_pal