Although it is presented as a collection of lecture notes on numerical analysis, this is essentially a full-fledged online book on the topic. Written by a professor of mathematics at Pennsylvania State University, the 125-page document spans three chapters and covers various forms of differential and difference equations, methods for solving them, and linear algebra. Scattered throughout the text...

Three complete textbooks are provided on this site. They cover numerical methods, applications, and data analysis in the C, Fortran 77, and Fortran 90 programming languages. Each book is structured in nearly the same way, with similar chapters and topic arrangement. The only feature missing from the online version of these books is the sample source code. There are some restrictions on permitted...