Counts the number of graphs in a list that satisfy certain restraints as given in the filter (see
buildGraphFilter). Notice that the input list can be graphs represented as instances of the class
Graph or in a nauty-based
String format.
For example, we can count the number of connected graphs on five vertices.
i1 : L = generateGraphs 5;
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i2 : countGraphs(L, {"Connectivity" => 0, "NegateConnectivity" => true})
o2 = 21
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