Inverse Z-transform with negative Z-exponents
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I am faced with a Z-transform problem for school, and I already know the code to handle most of the problem using matrices for the numerator and denominator. My trouble is that the problem uses negative-exponents for the Zs.
x(z) = (z^-3)/((1 - z^-1)(1 - 0.2z^-1))
If this problem had only positive exponents, but the same coefficients, I would approach inputing this particular problem like this:
MATLAB code
syms z
%x(z) = (z^3)/((-z^1 + 1)(-0.2z^1 + 1))
num=[1 0 0 0];
den=conv([-1 1],[-0.2 1]);
Any thoughts for using a similar input style with negative exponents? Would it really be as simple as something like 'fun(-1)'?
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