基于matlab边界元的经典算法。垂直接地极半径r=0.05m，长度l=0.5m,垂直接地极上电位V0=30V,边界元法求解径向向外8个点的电势.-Classical algorithm matlab Boundary Element. Vertical ground electrode radius r = 0.05m, length l = 0.5m vertical grounding on potential V0 = 30V, the Boundary Element Method r