amat: Extract adjacency matrix from tpdag, cpdag, tpag or pag...

In causalDisco: Tools for Causal Discovery on Observational Data

Extract adjacency matrix from tpdag, cpdag, tpag or pag object

Description

If the input is a tpdag or cpdag, the resulting adjacency matrix A is "from-to" matrix encoded as follows: - A(i,j) = 1 and A(j,i) = 0 means there is an edge j -> i. - A(j,i) = 1 and A(i,j) = 0 means there is an edge i -> j. - A(i,j) = 1 and A(j,i) = 1 means there is an undirected edge between i and j, i - j. - A(i,j) = 0 and A(j,i) = 0 means there is no edge between i and j.

Usage

amat(x)

Arguments

x	tpdag, cpdag, tpag, or pag object as obtained from tpc, pc, tfci, or fci, respectively.

Details

If the inout is a tpag or pag, there are four possible entry values: 0 (no edge), 1 (circle), 2 (arrowhead), 3 (tail). It is still encoded as a "to-from" adjacency matrix, which means that e.g. A(i,j) = 1 places a circle in the directed from j to i. For example, if A(i,j) = 1 and A(j,i) = 2, we have that i o-> j. Similarly, A(i,j) = 2 and A(j,i) = 3 mean that i <- j.

causalDisco documentation built on Jan. 20, 2026, 5:09 p.m.