电网络matlab编程，对复杂电路用程序进行编程计算。-Electricity network matlab programming and application programming calculation complex circuit

编写程序，输入电路情况后，程序运算结果给出对应电网络的所有树，并计算各树的树枝导纳积。-Programming, the input circuit, the program gives the corresponding result of the operation of all electrical network tree and calculate the tree s branches admittance plot.