描述simulink中matlab function模块程序运行报出Output argument ‘U_bus‘ is not assigned on some execution paths.

simulink中matlab function模块程序运行出现Output argument ‘U_bus‘ is not assigned on some execution paths.对于simulink模型中出现报错解决办法是将输出信号前开始预赋值初始值（如a=single(0)）。