Algorithm 1. Summary of the calculation for the 1D myocyte strand model.

Step1: Calculate conductance matrix of A, B, C in Equation (9);

Step2: Calculate the inverse matrix of the conductance matrix of A, B, C;

Step3: Calculate the right-hand side of Equation (9) from $V_{m,\mathrm{n}}^t$;

Step4$: \mathrm{Calculate} V_{o,\mathrm{n}}^t$ in Equation (9) by using the inverse matrix obtained in Step 2;

Step5$: \mathrm{Calculate} V_{i,n}^t$$\mathrm{from} V_{o,n}^t$$\mathrm{and} V_{m,n}^t$ using Equation (5);

Step6$: \mathrm{Calculate} I_{i,n}^t$$\mathrm{from} V_{i,n}^t$$\mathrm{and} V_{\mathrm{i},\mathrm{n}+1}^t$ using Equation (6);

Step7$: \mathrm{Calculate} I_{o,n}^t$$\mathrm{from} I_{i,n}^t$$\mathrm{and} I_{i,n-1}^t$ using Equation (7);

Step8$: \mathrm{Determine} \frac{d{V}_{m,n}^t}{dt}$$\mathrm{using} \mathrm{total} \mathrm{membrane} \mathrm{current} I_{m,n}^t$$\mathrm{and} I_{o,n}^t$                          $\frac{d{V}_{m,n}^t}{dt}=\frac{I_{c,n}^t}{C_m}=\frac{-\left(I_{m,n}^t-I_{o,n}^t\right)}{C_m}$;

Step9: Integration of parameters for the next time step                          $V_{m,n}^{t+dt}=V_{m,n}^t+\frac{d{V}_{m,n}^t}{dt}·dt$;

Step10: Go to Step3.