The CircularChromaticNumber command returns the circular chromatic number of a graph G.

If a name col is specified, then this name is assigned the list of colors of an optimal proper coloring of vertices. The algorithm uses a backtracking technique.

$\mathrm{with}\left(\mathrm{GraphTheory}\right)\:$

$\mathrm{with}\left(\mathrm{SpecialGraphs}\right)\:$

$G≔\mathrm{FlowerSnark}\left(5\right)\:$

$\mathrm{CircularChromaticNumber}\left(G\,'\mathrm{col}'\right)$

$\frac{5}{2}$

$\mathrm{col}$

$\left[0\,2\,4\,1\,3\,2\,0\,2\,0\,2\,4\,1\,4\,1\,3\,1\,3\,0\,3\,0\right]$