This applications-oriented book teaches students and engineers how to employ mathematical techniques for simulation and data processing using Mathcad. It is designed as a reference for practicing engineers or for use as a standard university course text, illustrating practical examples from computational science (such as optics, environmental science, chemistry, biology, tomography, economics, etc). The authors describe the most popular classical algorithms and modern techniques with all of the examples computed in Mathcad (on CD-ROM).