Produces a graph.

## Usage

```
as_graph(from, ...)
# S4 method for IntervalMatrix
as_graph(from)
# S4 method for StratigraphicMatrix
as_graph(from)
```

## Arguments

- from
A square adjacency matrix (typically an AdjacencyMatrix object).

- ...
Currently not used.

## Methods (by class)

`as_graph(IntervalMatrix)`

: Produces an interval graph.`as_graph(StratigraphicMatrix)`

: Produces a stratigraphic graph.