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An earlier question here mentioned Control`PoleZeroPlot, which I've found useful. Typing Names["*`PoleZeroPlot] returns

{"Charting`PoleZeroPlot", "Control`PoleZeroPlot", "PoleZeroPlot"}

Mysteriously, when I type PoleZeroPlot into Mathematica, it knows nothing about it. Digging around in the installation directories for Mathematica doesn't turn up any Control package. Where can I find documentation on PoleZeroPlot?

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    $\begingroup$ Unfortunately not everything is documented, in which case if I can't find anything useful on MSE I typically have to make do by making educated guesses on how a function would work. $\endgroup$ – user6014 Apr 4 '17 at 16:35
  • $\begingroup$ I'd like to see the source code, if nothing else. $\endgroup$ – Rodney Price Apr 4 '17 at 16:40
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    $\begingroup$ Then you'll want to see this. $\endgroup$ – J. M. is in limbo Apr 4 '17 at 16:42
  • $\begingroup$ Needs["GeneralUtilities'"]; PrintDefinitions[symbol]; pops up exactly what I need (version 11.0.1.0). Thank you! $\endgroup$ – Rodney Price Apr 4 '17 at 17:47