The NAG C Library of numerical algorithms for C and C++ has been expanded with the addition of more than 150 new functions — it now contains over 1,300 user-callable functions that are widely used for chemical application development. The functions can be used in a wide range of operating systems, languages, environments and packages, such as Excel, Java, MATLAB, and .NET/C#. Enhancements have been made in the areas of statistics, optimization, linear algebra, ordinary differential equations, regression, random numbers, sorting, and special functions.