Produces a graph.
as_graph(from, ...) # S4 method for IntervalMatrix as_graph(from) # S4 method for StratigraphicMatrix as_graph(from)
A square adjacency matrix (typically an AdjacencyMatrix object).
Currently not used.
as_graph(IntervalMatrix): Produces an interval graph.
as_graph(StratigraphicMatrix): Produces a stratigraphic graph.
An interval graph is the graph showing intersecting intervals on a line. As time is linear and not circular, an interval graph contains no cycles with more than three edges and no shortcuts.