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Matlab command for inverse z transform iztransonly applicable for causal signals? or also valid for non causal signals?

Actually i want to find inverse z transform for the cases shown in attached snap and i am confused if iztrans command is applicable to all of them? enter image description here

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  • $\begingroup$ If you share with us what you're trying to do, we may be of more help. I.e., if you're working on Wiener filters and need to separate the causal and non-causal parts of the answer, say so and we may be able to help you find a method. $\endgroup$
    – TimWescott
    Mar 19 at 20:12
  • $\begingroup$ This looks like a homework question. We'll answer it, but only in such a way as to help you get to the answer. For the three questions you've added since I posted my answer, please let us know how you'd go about establishing whether iztrans can help. We can then guide you if you go astray. Please edit your question with this extra information, and ping me and I'll reopen the question. Hint: look up "region of convergence". $\endgroup$
    – Peter K. ♦
    Mar 20 at 11:18

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Reading the manual entry from the Mathworks website:

Screenshot of iztrans manual.

the $n = 0, 1, 2, \ldots$ suggests that it's only considering the causal component.

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    $\begingroup$ And their examples give ans = 2^n + 2^n*(n - 1), which says that if they see a pole outside the unit circle they'll interpret it as a causal unstable system, not a non-causal stable one. $\endgroup$
    – TimWescott
    Mar 19 at 20:11

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