How to edit the red "+" marks on the Nyquist plot

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ayumi obitsu
ayumi obitsu 2024-7-5
评论： Steven Lord 2024-7-9
Is there a way to change the thickness and color of the red + marks that appear when drawing a Nyquist diagram?

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Voss
Voss 2024-7-5
Ran in:
H = tf([2 5 1],[1 2 3]);
nyquist(H)
h = findall(gcf(),'Type','line')
h =
5x1 Line array: Line Line Line Line Line
mkr = get(h,'Marker')
mkr = 5x1 cell array
{'+' } {'none'} {'none'} {'none'} {'none'}
h = h(strcmp(mkr,'+'));
h.LineWidth = 5;
h.Color = [0 1 0];
h.MarkerSize = 20;
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Voss
Voss 2024-7-9
You're welcome!
Regarding the line of code you asked about, before that line is executed, h contains all the line objects in the figure. That line of code compares the marker of each line object to '+' and keeps only the line objects whose marker is '+', so that afterwards h contains only those line objects whose marker is '+'.
Steven Lord
Steven Lord 2024-7-9
Ran in:
A slightly simpler approach would be to directly findobj all objects whose Marker property is '+'.
H = tf([2 5 1],[1 2 3]);
nyquist(H)
h = findall(gcf(),'Marker', '+')
h =
Line with properties: Color: [1 0 0] LineStyle: '-' LineWidth: 0.5000 Marker: '+' MarkerSize: 6 MarkerFaceColor: 'none' XData: -1 YData: 0 ZData: -10 Use GET to show all properties
The properties (specifically Color, Marker, XData, and YData) indicate that this is the "line" that is the red + symbol. This avoids the strcmp call.

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Umar
Umar 2024-7-5

Hi Ayumi,

To change the thickness and color of the red + marks in a Nyquist diagram, you can modify the properties of the plot after generating it. Below is an example illustrating how to achieve this customization. So, first, I will create a transfer function G as an example.Next, generate the Nyquist plot using the nyquist function. Afterwards, access the current figure handle and find all lines with a red color (indicating the + marks). Finally, we set the line width to 2 and change the color to blue for better visibility.

>> % Create a transfer function G = tf([1], [1, 2, 1]);

% Generate the Nyquist plot figure; nyquist(G);

% Access the current figure and set properties of the red + marks h = gcf; % Get current figure handle redPlusMarks = findall(h, 'Type', 'line', 'Color', [1 0 0]); % Find red lines set(redPlusMarks, 'LineWidth', 2); % Set line width to 2 set(redPlusMarks, 'Color', [0 0 1]); % Set color to blue

Please see attached plot as reference.

By following this approach, you can easily customize the appearance of the red + marks in Nyquist diagrams according to your preferences.

  1 个评论
ayumi obitsu
ayumi obitsu 2024-7-9
Mr.Umar
Thank you for your reply.
I was able to successfully change the color and thickness of the + mark.

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