# Where is documentation for ControlPoleZeroPlot? [duplicate]

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

{"ChartingPoleZeroPlot", "ControlPoleZeroPlot", "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?

• 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. – user6014 Apr 4 '17 at 16:35
• I'd like to see the source code, if nothing else. – Rodney Price Apr 4 '17 at 16:40
• Then you'll want to see this. – J. M. is in limbo Apr 4 '17 at 16:42
• Needs["GeneralUtilities'"]; PrintDefinitions[symbol];` pops up exactly what I need (version 11.0.1.0). Thank you! – Rodney Price Apr 4 '17 at 17:47