Test for cycles in biograph object
|BGObj||Biograph object created by biograph (object constructor).|
Tip For introductory information on graph theory functions, see Graph Theory Functions.
isdag(BGObj) returns logical 1 (true) if an N-by-N adjacency matrix extracted from a biograph object, BGObj, is a directed acyclic graph (DAG) and logical 0 (false) otherwise. In the N-by-N sparse matrix, all nonzero entries indicate the presence of an edge.
 Siek, J.G., Lee, L-Q, and Lumsdaine, A. (2002). The Boost Graph Library User Guide and Reference Manual, (Upper Saddle River, NJ:Pearson Education).