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### History and What's New

##### Boost-1.37.0

- Improved accuracy and testing of the inverse hypergeometric functions.

##### Boost-1.36.0

- Added Noncentral Chi Squared Distribution.
- Added Noncentral Beta Distribution.
- Added Noncentral F Distribution.
- Added Noncentral T Distribution.
- Added Exponential Integral Functions.
- Added Zeta Function.
- Added Rounding and Truncation functions.
- Added Compile time powers of runtime bases.
- Added SSE2 optimizations for Lanczos evaluation.

##### Boost-1.35.0: Post Review First Official Release

- Added Policy based framework that allows fine grained control over function behaviour.
- Breaking change: Changed default behaviour for domain, pole and overflow errors to throw an exception (based on review feedback), this behaviour can be customised using Policy's.
- Breaking change: Changed exception thrown when an internal evaluation error occurs to boost::math::evaluation_error.
- Breaking change: Changed discrete quantiles to return an integer result: this is anything up to 20 times faster than finding the true root, this behaviour can be customised using Policy's.
- Polynomial/rational function evaluation is now customisable and hopefully faster than before.
- Added performance test program.

##### Milestone 4: Second Review Candidate (1st March 2007)

- Moved Xiaogang Zhang's Bessel Functions code into the library, and brought them into line with the rest of the code.
- Added C# "Distribution Explorer" demo application.

##### Milestone 3: First Review Candidate (31st Dec 2006)

- Implemented the main probability distribution and density functions.
- Implemented digamma.
- Added more factorial functions.
- Implemented the Hermite, Legendre and Laguerre polynomials plus the spherical harmonic functions from TR1.
- Moved Xiaogang Zhang's elliptic integral code into the library, and brought them into line with the rest of the code.
- Moved Hubert Holin's existing Boost.Math special functions into this library and brought them into line with the rest of the code.

##### Milestone 2: Released September 10th 2006

- Implement preview release of the statistical distributions.
- Added statistical distributions tutorial.
- Implemented root finding algorithms.
- Implemented the inverses of the incomplete gamma and beta functions.
- Rewrite erf/erfc as rational approximations (valid to 128-bit precision).
- Integrated the statistical results generated from the test data with Boost.Test: uses a database of expected results, indexed by test, floating point type, platform, and compiler.
- Improved lgamma near 1 and 2 (rational approximations).
- Improved erf/erfc inverses (rational approximations).
- Implemented Rational function generation (the Remez method).

##### Milestone 1: Released March 31st 2006

- Implement gamma/beta/erf functions along with their incomplete counterparts.
- Generate high quality test data, against which future improvements can be judged.
- Provide tools for the evaluation of infinite series, continued fractions, and rational functions.
- Provide tools for testing against tabulated test data, and collecting statistics on error rates.
- Provide sufficient docs for people to be able to find their way around the library.

SVN Revisions:

Sandbox and trunk last synchonised at revision: 448300.