1\begin{equation*} 2\begin{split} 3& cg(A,x,b,i_{max},\epsilon): \\ 4& \quad i \Leftarrow 0 \\ 5& \quad r \Leftarrow b - A x \\ 6& \quad d \Leftarrow r \\ 7& \quad \delta_{0} \Leftarrow r^T r \\ 8& \quad \delta_{ } \Leftarrow \delta_{0} \\ 9& \quad \text{while}\;\; i < i_{max} \text{ and } \\ 10& \quad\quad\qquad \delta_{ } > \delta_{0} \epsilon^2 \text{ do} :\\ 11& \quad\quad\quad q \Leftarrow Ad \\ 12& \quad\quad\quad \alpha \Leftarrow \frac{\delta_{ }}{d^T q} \\ 13& \quad\quad\quad x \Leftarrow x + \alpha d\\ 14& \quad\quad\quad r \Leftarrow r - \alpha q\\ 15& \quad\quad\quad \delta_{old} \Leftarrow \delta_{ } \\ 16& \quad\quad\quad \delta_{ } \Leftarrow r^T r \\ 17& \quad\quad\quad \beta \Leftarrow \frac{\delta_{ }}{\delta_{old}} \\ 18& \quad\quad\quad d \Leftarrow r + \beta d\\ 19& \quad\quad\quad i \Leftarrow i + 1 20\end{split} 21\end{equation*} 22