运用MATLAB编程并结合simulink解决简单的电路问题。

自选题目：图1所示为典型的直流电阻电路[3], 含有电压控制的受控电流源VCCS，其中，R1=1Ω,R2= 2Ω, R3=3Ω,US=10V, IS=15A, VCCS= ，现需分析计算电流i1和电压u2

-Combined with the use of MATLAB simulink program to solve simple circuit problems. Optional Title: Figure 1 shows a typical DC resistance of the circuit [3], with voltage-controlled current source controlled VCCS, which, R1 = 1Ω, R2 = 2Ω, R3 = 3Ω, US = 10V, IS = 15A, VCCS =, now need to be analyzed to compute the current and voltage u2 i1