7-34  Z任
⣺Enterȷϡ
>> syms k n w z
>> ztrans(2^n)
ans =
1/2*z/(1/2*z-1)
>> ztrans(sin(k*n),w)
ans =
w*sin(k)/(w^2-2*w*cos(k)+1)
>> ztrans(cos(n*k),k,z)
ans =
(z-cos(n))*z/(z^2-2*z*cos(n)+1)
>> ztrans(cos(n*k),n,w)
ans =
(w-cos(k))*w/(w^2-2*w*cos(k)+1)
>> ztrans(sym('f(n+1)'))
ans =
z*ztrans(f(n),n,z)-f(0)*z
>>
