constraints.matrix {HEMDAG}

Constraints matrix

Description

Return a matrix with two columns and as many rows as there are edges. The entries of the first columns are the index of the node the edge comes from (i.e. children nodes), the entries of the second columns indicate the index of node the edge is to (i.e. parents nodes). Referring to a dag this matrix defines a partial order.

Usage

constraints.matrix(g)

Arguments

g

a graph of class graphNELL. It represents the hierarchy of the classes.

Value

A constraints matrix w.r.t the graph g.

Examples

data(graph);
m <- constraints.matrix(g);