Pigon is an open source C++ library for scientific purposes

Introduction

Pigon is contains some tools for mathematics and physics. Programming principle that behind of Pigon is quite simple. This is more like an API rather than a library. Readability

A Quick Example

Matrix<float> m = { {2,5},
                    {3,7} };

Features

• Easy to learn
• Minimal (size & usage)
• No third-party dependencies
• Cross platform (Windows, Linux, Mac OS X) (gcc, clang, msvc)
• Written with pure mathematics
• High intelligibility and readability
• Performance-focused design

Installation

There are 2 steps for installation:

Step 1. Include

Include header files that you need like that:

#include "pigon/pigon.h"
#include "pigon/matrix.h"

Step 2. Initialization

// create a 4x4 unit matrix in float type
Matrixf m4x4(4, 4, MatrixType::Unit);

Usage

Some basic concepts are explained in this document about mathematics and physics in Pigon.

Matrix

Matrix tool has a lot of mathematical functions like that

• determinant
• transpose
• unique
• sum, product
• normalize
• shuffle
• inverse
• min, max

Initialization

It is possible to carry out an initialization in two ways:

1. Initializer List

// initialize a 3x3 matrix with initializer list
Matrix<float> m = { {1, 3, 5},
                    {2, 5, 6},
                    {4, 8, 7} };

2. With Constructor

// initialize a 3x3 random matrix with constructor function
Matrix<float> m(3, 3, MatrixType::Random);

Selection

In pigon, there are too many selection types for matrices.

Note: Row and col numbers starts from 0 in pigon.

// initialize a 3x3 matrix
Matrix<float> m = { {1, 3, 5},
                    {2, 5, 6},
                    {4, 8, 7} };

Selection of single element:

// row=1, col=2
std::cout << m[1][2] << std::endl; // 6 [row][col]
std::cout << m(1, 2) << std::endl; // 6 (row, col) these are same things

Selection an array of rows and single column

// row={0, 1}, col=2
Matrix<float> m_sub = m({0, 1}, 2);

Selection an array of rows and columns

// row={0, 1}, col={0, 1}
Matrix<float> m_sub = m({0, 1}, {1, 2});

By Select::type

// row=All, col={0, 2}
Matrix<float> m_sub = m(Select::All, {0, 2});

For select only even columns

// row=All, col={0, 2}
Matrix<float> m_sub = m({1, 2}, Select::Even);