Monomial subdigraphs of reachable and controllable positive discrete-time systems
International Journal of Applied Mathematics and Computer Science, Tome 15 (2005) no. 1, p. 159.

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A generic structure of reachable and controllable positive linear systems is given in terms of some characteristic components (monomial subdigraphs) of the digraph of a non-negative a pair. The properties of monomial subdigraphs are examined and used to derive reachability and controllability criteria in a digraph form for the general case when the system matrix may contain zero columns. The graph-theoretic nature of these criteria makes them computationally more efficient than their known equivalents. The criteria identify not only the reachability and controllability properties of positive linear systems, but also their reachable and controllable parts (subsystems) when the system does not possess such properties.
Classification : 93C55, 93B05, 05C90
Mots-clés : positive linear systems, monomial subdigraphs, reachability, controllability, system structure 
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Rafael Bru; Louis Caccetta; Ventsi Rumchev. Monomial subdigraphs of reachable and controllable positive discrete-time systems. International Journal of Applied Mathematics and Computer Science, Tome 15 (2005) no. 1, p. 159. https://geodesic-test.mathdoc.fr/item/IJAMCS_2005__15_1_207724/