Matrix model

Mathematics and physics

• In theoretical physics, a matrix model is a system (usually a quantum mechanical system) with matrix-valued physical quantities. See, for example, Lax pair.
• The "old" matrix models are relevant for string theory in two spacetime dimensions. The "new" matrix model is a synonym for "matrix theory."
• A concept from algebraic logic.

Biomedicine

• Matrix population models are used to model wildlife and human population dynamics.
• The Matrix Model of substance abuse treatment is a model developed by the Matrix Institute on Addictions in the 1980s to treat cocaine and methamphetamine addiction.
• Protein complexes: a matrix model of protein complexes (unrealistically) predicts that all proteins in a complex interact with all other proteins. Mathematically, a matrix model of a protein complex is a complete graph.

Management and economics

• The term "matrix model" is used to describe matrix management where each worker in an organisation has two managers, one "functional": managing their expertise, the other "executive": managing their work on a project.