node coloring failed with over 197 nodes

[hldwn]

using LightGraphs, GraphPlot;
using Colors;

n = 198
graph = barabasi_albert(n, 3, 3)

mapping = ones(n)
mapping[1:100] .= 2

nodecolor = [colorant"green", colorant"red"]
nodefillc = nodecolor[convert(Array{Int}, mapping)]
gplot(graph, nodefillc=nodefillc)

--> all nodes are black
if n<197 --> nodes are green and red

[Yuya-Furusawa]

I have a same problem.

On Jupyter Lab,

using Colors
using LightGraphs
using GraphPlot

node_colors_2 = [colorant"lightseagreen", colorant"orange"]
function plot_graph(n)
    circle = cycle_graph(n)
    actions = fill(2, n)
    nodefillc = node_colors_2[actions]
    gplot(circle, layout=circular_layout, nodefillc=nodefillc)
end

When n=99, the color of all nodes is orage, but when n=100, all nodes are black.

[hdavid16]

Duplicate of #156