dagR (version 1.1.1)

is.acyclic: Check if a DAG actually is acyclic.

Description

This function checks for each node in a DAG whether backtracing arcs leading to it results in an "infinite recursion" error indicating that there actually is a cyclic part in the DAG (which then obviously seems not to be a DAG).

Usage

is.acyclic(dag, maxSecs=NA)

Arguments

dag

The DAG to be check.

maxSecs

maximum time before function aborts;

Value

• A list with two elements. acyclic is a boolean indicating whether the DAG is acyclic (=TRUE) or contains a cyclic component (=FALSE). nodewise is a vector containing 1 boolean per node in the DAG, TRUE indicating that backtracing from this node does not lead to a cyclic component, FALSE indicating that backtracing from this node leads to a cyclic component.

Examples

dag6<-demo.dag6();
is.acyclic(dag6);
dag6c<-add.arc(dag6, c(3,5));
is.acyclic(dag6c);