COO_format.txt

/*
 
 // typical C/C++ implementation of a Coordinate (COO) matrix format  
 // (aka Triplet or TRIAD or IJV format) 
 
 struct typical_coo_matrix {
 
 size_t N;                    // matrix dimension
 size_t num_non_zero_coeffs;  // number of non-zero coefficients
 size_t row_indices[];        // row indices (array of size num_non_zero_coeffs)
 size_t column_indices[];     // column indices (array of size num_non_zero_coeffs)
 double values[];             // non-zero coefficients (array of size num_non_zero_coeffs)
 
};

// array with row indices is sorted, ensuring that entries with the same row index 
// are stored contiguously.

 */