ex040400.m

Digital signal processing using Matlab一書之範例程式

% Chapter 4: Example 4.4:
%  X(z) using ztrans
%   x(n) = (n-2)(0.5)^(n-2)cos[pi*(n-2)/3]u(n-2)
x = 'n*((0.5)^n)*cos(pi*n/3)';
X = ztrans(sym(x));
[nX,dX] = numden(X);
expand(nX), expand(dX);
dX = symmul(dX,'z^2'); expand(dX)