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This matrix class is a little screwy, it is displaying weird numbers
#include <iostream>
#include <cstddef>
#include <vector>

template<typename T> class matrix
    matrix(std::size_t r = 4, std::size_t c = 4, T val = T())
    	: rows(r), columns(c)
   	    for (std::size_t k = 0; k < rows; k++) 
   	        for (std::size_t j = 0; j < columns; j++) 
    friend std::ostream& operator<<(std::ostream& out, const matrix& m)
        for (std::size_t k = 0; k < m.rows; k++) 
   	        for (std::size_t j = 0; j < m.columns; j++)
   	        	out << m.rows_vec[k][j] << ' ';
       	    out << '\n';
    std::vector<T>& operator[](std::size_t i) { return rows_vec[i]; }
    const std::vector<T>& operator[](std::size_t i) const { return rows_vec[i]; }
    std::size_t rows, columns;
    std::vector<T> cols_vec;
    std::vector<std::vector<T> > rows_vec;

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