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Change rlocus() axis units to Hz?

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John on 24 Mar 2023
Commented: Star Strider on 28 Mar 2023
How can I change the plotted rlocus() real axis units to Hz, vs rad/s?
I tried Property Editor --> clicking on X axis --> More Properties --> Units --> Frequency field --> Hz, but didn't seem to change the plot.
I tested with a single pole at -10, plotting 1/(s+10), and the pole remained at -10 regardless of Hz or Rad/s setting.

Accepted Answer

Star Strider
Star Strider on 24 Mar 2023
Edited: Star Strider on 25 Mar 2023
First, use rlocusplot since it allows options —
sys = tf([2 5 1],[1 2 3]);
hrlp = rlocusplot(sys);
opts = getoptions(hrlp)
opts = FreqUnits: 'rad/s' TimeUnits: 'seconds' ConfidenceRegionNumberSD: 1 IOGrouping: 'none' InputLabels: [1×1 struct] OutputLabels: [1×1 struct] InputVisible: {0×1 cell} OutputVisible: {0×1 cell} Title: [1×1 struct] XLabel: [1×1 struct] YLabel: [1×1 struct] TickLabel: [1×1 struct] Grid: 'off' GridColor: [0.1500 0.1500 0.1500] XLim: {[-2.5000 0.5000]} YLim: {[-1.5000 1.5000]} XLimMode: {'auto'} YLimMode: {'auto'}
setoptions(hrlp, 'FreqUnits','Hz')
Second, it doesn’t display frequency values or units, although you can certainly set them. (The same options are available on other plot functions. For a full list of the available plot functions, see the setoptions documentation section p.)
EDIT — (25 Mar 2023 at 10:48)
Clarified code. No substantive changes.
John on 28 Mar 2023
Thanks @Star Strider and @Paul. That helped.
Star Strider
Star Strider on 28 Mar 2023
As always, my pleasure!

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