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 (missing documentation) 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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