Cycles
This option finds the cycles in a graph. For undirected graphs, 'cycles' that involve shuttling back and forth along a single edge are ignored.
The first line specifies the calculation required. It must contain
format cycle
| Column | Description |
|---|---|
| 1 | l for link |
| 2 | src node name |
| 3 | dst node name |
format cycle
l a b
l b c
l c d
l d a
The algorithm is a modified depth first search. When a previously visited vertex is reached, the Dijsktra algorithm is applied to find the path that forms the shortest cycle that leads back to the back edge to the previously visited vertex.