An S4 class to represent a stratigraphic matrix.

Details

A stratigraphic matrix represents directed relationships between stratigraphic units. A stratigraphic matrix is an adjacency matrix (a non symmetric square matrix with zeros on its main diagonal), suitable to build a directed acyclic graph (DAG).

Author

N. Frerebeau

Examples

# Principles of Archaeological Stratigraphy, fig. 12
harris <- matrix(
  data = c(2, 1,
           3, 1,
           4, 1,
           5, 2,
           5, 3,
           5, 4,
           6, 5,
           7, 1,
           7, 6,
           8, 1,
           8, 6,
           9, 7,
           9, 8),
  ncol = 2,
  byrow = TRUE,
  dimnames = list(NULL, c("lower", "upper"))
)

strati <- as_stratigraphy(harris)