设一因果LTI系统的差分方程为 y(n)-2y(n-1)+3y(n-2)=x(n)+4x(n-1)+5x(n-2)-6x(n-3) 并且已知初始条件为y(-1)=-1,y(-2)=1,输入x(n)=0.2 n u(n),利用MATLAB求系统的输出y(n)。
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