请问如何用matlab求解随机过程的均值和方差已知:r=2S+N(Wi^2+Wq^2)±2(√SN)(Wi+Wq) i,q下标r^2=4SN(Wi+Wq)^2±4(√SN)(Wi+Wq)[2S+N(Wi^2+Wq^2)]4S^2+4SN(Wi^2+Wq^2)+N^2(Wi^2+Wq^2)^2用matlab编程就均值和方差

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