Change marker colour of pzplot

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Jan
Jan 2025-1-27
评论： Jan 2025-1-27
Hello everyone
I'm trying to change the marker color in the pzplot graph. I'm using version 2024b (edit:) and a LiveScript.
Apparently the code below works for a regular script, but doesn't work in a LiveScript. Maybe this is a rendering bug?
Apparently, in this version, a new object(?) called "PZPlot Properties" was introduced, which is great.
Using this new object, I can easily change the size and line thickness of all markers. But I can also only change the colour of all markers. I'd like to change the colours of the markers for the poles and zeros separately.
I tried using the "findobj" method and found, that the PZPlot apparently consists of two Scatter-Plots called "PZPoleScatter" and "PZZeroScatter", and I tried changing the color of the markers in those Scatter plots, but this does not seem to have an effect on the markers.
When I change the colour of the markers using the PZPlot properties Object, I see the color definition of the markers in both scatter plots change, and I can also see that the colours change if I directly access the properties and change the colour, but the plot isn't drawn with those correct colors.
I tried using refresh after changing the values, but that doesn't have any effect either.
See my code below:
s = tf('s');
f = (1 + 1/s)
pzp = pzplot(f);
% See https://ch.mathworks.com/help/ident/ref/controllib.chart.pzplot-properties.html for new PZPlot-properties object
pzp.Responses.MarkerSize = 10;
pzp.Responses.LineWidth = 2;
%pzp.Responses.Color = 'green'; % Changes colour of all markers
oPole = findobj(gca, 'Tag', 'PZPoleScatter');
oPole.MarkerEdgeColor = 'red';
oZero = findobj(gca, 'Tag', 'PZZeroScatter');
oZero.MarkerEdgeColor = 'blue';
rsp = findobj(gca, 'Tag', 'PZPoleScatter'); % read object again to see if properties got changed correctly
I also found the following two topics, but they do not work anymore as there is no "Line" child in the PZPlot object.
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Voss
Voss 2025-1-27
"Could you maybe test if the code also doesn't work for you in a LiveScript?"
Unfortunately, my only option to run the code is here in the Answers forum because I don't have a license for any toolbox containing pzplot.
Jan
Jan 2025-1-27
Ah, dang it. Well, that's a bummer. I hope anybody else can chime in here and could test it.

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采纳的回答

Andrew Ouellette
Andrew Ouellette 2025-1-27
Ran in:
Hi Jan,
Starting in 24b, we introduced new chart and response objects for pzplot().
Each model you input to pzplot() will generate a single response object, which allows you to customize the styling for your response graphics. However, you are correct in that you can only pick a single styling for each response, which all graphics belonging to that response will then match. If you want to split the poles & zeros for a model, I recommend creating a pole-only model and a zero-only model.
s = tf('s');
f = (1 + 1/s);
fpoles = tf(1,f.Denominator{1});
fzeros = tf(f.Numerator{1},1);
pzp = pzplot(fpoles,fzeros);
pzp.Responses(1).MarkerSize = 10;
pzp.Responses(1).LineWidth = 2;
pzp.Responses(1).Color = 'r';
pzp.Responses(2).MarkerSize = 10;
pzp.Responses(2).LineWidth = 2;
pzp.Responses(2).Color = 'b';
●
Live scripts are a bit of an edge case when it comes to graphics. You'll find that the same behavior occurs when you save & load a figure containing a PZPlot- your changes made using findobj will be obliterated. Using findobj in this manner to change graphics within a PZPlot never notifies the chart object, and thus your changes cannot be serialized. Live scripts will only support changes made using our provided chart API.
  1 个评论
Jan
Jan 2025-1-27
Hello Andrew, thanks for chiming in!
I expected that I could somehow trigger a refresh of the plot using something like "refresh()" or "redraw()", but sadly that's not the case.
I guess I have to split my plot into poles and zeros as you suggested. At least that's a working solution!

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