Algorithm 1 Calculating $\varphi \left(\delta T\right)$

Input: $f\left(\delta T\right)$, $f\left(\right(\delta -1\left)T\right)$  Output: $\varphi \left(\delta T\right)$ 1:if$f\left(\delta T\right)-f\left(\right(\delta -1\left)T\right)<0$then 2: $\varphi \left(\delta T\right)\leftarrow$ $\varphi \left(\right(\delta -1\left)T\right)+{\varphi }_0$ 3:else 4: $\varphi \left(\delta T\right)\leftarrow$ $\varphi \left(\right(\delta -1\left)T\right)-{\varphi }_0$ 5:end if