math

Documentation and code examples are available at http://asaparov.org/docs/math. The repository is located at https://github.com/asaparov/math.

This repository contains a handful of data structures and algorithms for common mathematical operations in scientific computing.

### Dependencies

To use the code, simply download the files into a folder named "math". Add this folder to the include path for the compiler, for example by using the `-I`

flag.

This library depends on core and the data structures and procedures follow the same paradigm as core. Otherwise, there are no dependencies on external libraries. The code makes use of `C++11`

and is regularly tested with `gcc 6`

but I have previously compiled it with `gcc 4.8`

, `clang 4.0`

, and `Microsoft Visual C++ 14.0 (2015)`

. The code is intended to be platform-independent, so please create an issue if there are any compilation bugs.

### Overview

This library contains the following files:

distributions.h contains structures that represent various probability distributions, such as the Dirichlet (both symmetric and general), categorical (implemented using a dense array or sparsely using a hash_map), discrete uniform, and sequence distributions. This file contains functions for computing the probabilities and log probabilities of events according to these distributions, as well as generating samples from them.

features.h contains structures for representing feature vectors, which are commonly used in machine learning.

histogram.h contains histogram data structures, which are structures that count the number of occurrences of distinct elements in a set.

log.h contains functions to perform arithmetic in log space, while avoiding loss of floating-point precision.