MATLAB is an interactive system for numerical computation that is widely used for teaching and research in industry and academia. It provides a modern programming language and problem solving environment, with powerful data structures, customizable graphics, and easy-to-use editing and debugging tools. This third edition of the MATLAB Guide completely revises and updates the best-selling second edition and is over thirty per cent longer. Colour figures are provided throughout and major updates to the MATLAB graphics system are fully reflected. The book remains a lively, concise introduction to the most popular and important features of MATLAB and the Symbolic Math Toolbox. Key features include a tutorial that gives a hands-on overview of MATLAB, a thorough treatment of MATLAB mathematics, including the linear algebra and numerical analysis functions and the differential equation solvers, and a webpage at http://www.siam.org/books/ot150 that provides example program files, updates, and links to MATLAB resources.