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Inverse Z Transform using MatLab (HELP)

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goosiegoo

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z transform matlab

i have to make this 2 programs, if anyone could help me out, i would apreciate it:
1- Write a MATLAB program to compute the first L samples of the inverse of a rational z-transform where the value of L is provided by the user through the command input. Using this program, compute and plot the first 50 samples of of the inverse of G(z) from Eq. 3.32. Use the command stem for plotting the sequence generated my the inverse transform.

where G(z) =
(2+ 5z^-1 +9z^-2 +5z^-3 +3z^-4 ) /(5 + 45z^-1 +2z^-2 +z^-3 +^z^-4)

2- Wirte a MatLab program to determine the partial-fraction expansion of a rational z-transform. Using this program determine the partial-fraction expansion of G(z) (the one from above). and then it's inverse transform
g[n] in closed form . Assume g[n] to be casual sequence.
 

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