cpp-simple-matrix

This is a fixed-size, 2D array template without numeric operations and boundary checking. Being useful to pass 2D data to a function, it is simple and handy to use rather than complicated building and configuration. However, if it's not what you are looking for. For a fully functional matrix on linear algebra, see Eigen or Boost.uBLAS. For a higher dimension array, see Boost.MultiArray.

Usage

Download the matrix.h file and include it. No library has to be linked.

Example

#include "matrix.h"
#include <iostream>
using namespace std;

int main() {
	matrix<int> foo(1,3);
	
	foo.at(0,0)=1;
	foo(0,1)=8;
	foo[0][2]=3;
	
	cout<<"size: ";
	cout<<foo.get_m()<<"x";
	cout<<foo.get_n()<<endl;
	
	return 0;
}

Reference

The matrix class template is defined as follows.

template <typename T> class matrix;

• T: the type of the elements

Constructors

• matrix() (the default constructor)

• matrix(int m, int n) constructs an m-by-n matrix.

• matrix(const matrix &mat) (the copy constructor)

Member Functions

• matrix &operator = (the copy assignment)

• int get_m() const returns the number of rows.

• int get_n() const returns the number of columns.

element access

There are 3 ways to access the (i,j)th element.

#	declaration	description	example
1.	T &at(int i, int j)	by the member function	foo.at(i, j)
2.	T &operator ()	by a more compact syntax	foo(i, j)
3.	T &operator [] .operator []	as a traditional 2D array (slower)	foo[i][j]

Non-member functions

• void swap(matrix<T> &a, matrix<T> &b) exchanges the contents of two matrices.