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### 31.3 System display functions

— Function File: sysout (sys, opt)

> print out a system data structure in desired format

> sys
>   system data structure
> opt
>   Display option
>   `[]`
>     primary system form (default)
>   `"ss"`
>     state space form
>   `"tf"`
>     transfer function form
>   `"zp"`
>     zero-pole form
>   `"all"`
>     all of the above

— Function File: tfout (num, denom, x)

> Print formatted transfer function n(s)/d(s) to the screen. x defaults to the string `"s"`

> See also: polyval, polyvalm, poly, roots, conv, deconv, residue, filter, polyderiv, polyinteg, polyout.

— Function File: zpout (zer, pol, k, x)

> print formatted zero-pole form to the screen. x defaults to the string `"s"`

> See also: polyval, polyvalm, poly, roots, conv, deconv, residue, filter, polyderiv, polyinteg, polyout.