This library is divided into three interconnected parts:
Provides a reasonably comprehensive set of statistical distributions, upon which higher level statistical tests can be built.
Provides a small number of high quality special functions, initially these were concentrated on functions used in statistical applications along with those in the Technical Report on C++ Library Extensions.
The function families currently implemented are the gamma, beta & erf functions along with the incomplete gamma and beta functions (four variants of each) and all the possible inverses of these, plus digamma, various factorial functions, Bessel functions, elliptic integrals, sinus cardinals (along with their hyperbolic variants), inverse hyperbolic functions, Legrendre/Laguerre/Hermite polynomials and various special power and logarithmic functions.
All the implementations are fully generic and support the use of arbitrary
"real-number" types, including Boost.Multiprecision,
although they are optimised for use with types with known-about significand
(or mantissa) sizes: typically
The section Internal tools provides many of the tools required to implement mathematical special functions: hopefully the presence of these will encourage other authors to contribute more special function implementations in the future.
Some tools are now considered well-tried and their signatures stable and unlikely to change.
Other Internal tools are currently still considered experimental: they are "exposed implementation details" whose interfaces and/or implementations may change without notice.
There are also (experimental) classes for the manipulation of polynomials, for testing a special function against tabulated test data, and for the rapid generation of test data and/or data for output to an external graphing application.