How can I use double-sided z transform?

Question

Justin Fan 2020-6-6

回答： Asvin Kumar 2020-6-8

Can I use z transform to evaluate a function from negative infinity to positive infinity instead of from 0 to positive infinfity?

the z transform introduced by my textbook(Oppenheim Signals and Systems 2e) evaluate a function from negative infinity to positive infinity.

Answer 1

Asvin Kumar 2020-6-8

Currently the ztrans function does not support bilateral transforms. This is a known limitation and our developers are looking into it.

On the other hand, it should be possible to implement similar functionality using the symsum function from the Symbolic Math Toolbox.