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CreatorAndDestroyerEvents.md

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Symbols and Functions > WolframModel and WolframModelEvolutionObject > Properties >

Creator and Destroyer Events

An event is said to destroy the edges in its input, and create the edges in its output. Creator and destroyer events for each edge can be obtained with "EdgeCreatorEventIndices" (aka "CreatorEvents") and "EdgeDestroyerEventsIndices" properties.

As an example, for a simple rule that splits each edge in two, one can see that edges are created in pairs:

In[] := WolframModel[{{1, 2}} -> {{1, 3}, {3, 2}},
 {{1, 1}}, 4, "EdgeCreatorEventIndices"]
Out[] = {0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11,
   11, 12, 12, 13, 13, 14, 14, 15, 15}

and destroyed one-by-one:

In[] := WolframModel[{{1, 2}} -> {{1, 3}, {3, 2}},
 {{1, 1}}, 4, "EdgeDestroyerEventsIndices"]
Out[] = {{1}, {2}, {3}, {4}, {5}, {6}, {7}, {8}, {9}, {10}, {11}, {12},
   {13}, {14}, {15}, {}, {}, {}, {}, {}, {}, {}, {}, {}, {}, {}, {},
   {}, {}, {}, {}}

Here 0 refers to the initial state. Note the format is different for creator and destroyer events. That is because each edge has a unique creator event, but can have multiple destroyer events in multiway systems.

There is another property, "EdgeDestroyerEventIndices" (aka "DestroyerEvents"), left for compatibility reasons, which has the same format as "EdgeCreatorEventIndices". However, it does not work for multiway systems.

In[] := WolframModel[{{1, 2}} -> {{1, 3}, {3, 2}},
 {{1, 1}}, 4, "EdgeDestroyerEventIndices"]
Out[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, Infinity,
  Infinity, Infinity, Infinity, Infinity, Infinity, Infinity,
  Infinity, Infinity, Infinity, Infinity, Infinity, Infinity,
  Infinity, Infinity, Infinity}