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Determine if dynamic system model is stable

returns
a logical value of `B`

= isstable(`sys`

)`1`

(`true`

) if the dynamic system model
`sys`

has stable dynamics, and a logical value of `0`

(`false`

) otherwise. If `sys`

is a model array, then
the function returns `1`

only if all the models in `sys`

are stable.

`isstable`

returns a logical value of `1`

(`true`

) for stability of a dynamic system if:

In continuous-time systems, all the poles lie in the open left half of the complex plane.

In discrete-time systems, all the poles lie inside the open unit disk.

`isstable`

is supported only for analytical models with a finite number of
poles.