电力系统节点导纳矩阵的形成，在excel中输入对应的阻抗数据，通过matlab生成对应的阻抗矩阵Y阵-Forming a power system node admittance matrix, the input impedance of the corresponding data in excel, and generate the corresponding impedance matrix Y matrix by matlab

用于读取石油馏分的碳数分布矩阵，生成向量，并转存excel(Method of reading the carbon number distribution matrix, convert to vector, save to excel)