Change intensity of zplane figure

Question

Konstantinos 2023-11-3

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2042466-change-intensity-of-zplane-figure

评论： Konstantinos 2023-11-4

Hello everyone,

I was trying to change the line-width of the zplane figure in order to make it more visible.I tried the set command but it didnt work.How can i fix it so it can work?

Thanks in advance.

This is my code so far:

function Lab2_Part_One
    close all;
    clearvars;
    % Create directory if it doesn't exist
    directory = 'Ask1';
    if ~isfolder(directory) %For versions before R2017b use exist 
                            % instead of is folder
        mkdir(directory);
    end
    % Given transfer function
    num = [0.2 0]; % Numerator coefficients
    den = [1 -0.7 -0.18]; % Denominator coefficients
    w = -pi:pi/128:pi; % Frequency range
    % Function calls
    plotPoleZeroPlot(num, den, directory);
end
function plotPoleZeroPlot(num, den, directory)
    % Function to plot the pole-zero plot
    figure;
    h = zplane(num, den);
% Set the properties for poles (red lines)
set(h_poles, 'Color', 'green', 'LineWidth', 2); % Change color to green and line width
% Set the properties for zeros (blue lines)
set(h_zeros, 'Color', 'magenta', 'LineWidth', 1.5); % Change color to magenta and line width
% Redraw the unit circle with the desired linewidth
hold on;
t = 0:0.01:2 * pi; % Define points for the unit circle
plot(cos(t), sin(t), 'Color', [0 0.4470 0.7410], 'LineWidth', 1); % Plot the unit circle with the desired linewidth
    %grid on;
    title('Pole-Zero Plot of the Transfer Function H(z)');
    % Save the pole-zero plot in the specified directory as a PNG file
    filename = fullfile(directory, 'pole_zero_plot.png');
    saveas(gcf, filename);
end

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Answer 1

Star Strider 2023-11-3

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2042466-change-intensity-of-zplane-figure#answer_1346206

在 MATLAB Online 中打开

Changing the properties requirees a bit of handle-spelunking, however it is possible.

Try this —

[z,p,k] = ellip(4,3,30,200/500);

figure

zplane(z,p)

grid

title('4th-Order Elliptic Lowpass Digital Filter')

figure

hzp = zplane(z,p);

grid

title('4th-Order Elliptic Lowpass Digital Filter')

getgca = get(gca);

Kids = getgca.Children;

Kids(2).Color = 'g';

Kids(2).LineWidth = 2;

Kids(3).Color = 'm';

Kids(3).LineWidth = 1.5;

% figure

% hold on

% plot(Kids(1).XData, Kids(1).YData, ':')

% plot(Kids(2).XData, Kids(2).YData, 'xg', 'LineWidth',2)

% plot(Kids(3).XData, Kids(3).YData, 'om', 'LineWidth',1.5)

% hold off

% axis([[-1 1]*1.5 [-1 1]*1.25])

% grid

The zplane function creates 3 different line objects, and once they are found, changing their properties is straightforward.

.

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Star Strider 2023-11-4

在 MATLAB Online 中打开

So much for consistency. I was hoping that ordering would always work, It doesn’t.

So, Plan ‘B’ —

num = [0.2 0]; % Numerator coefficients

den = [1 -0.7 -0.18]; % Denominator coefficients

figure

zplane(num, den)

getgca = get(gca);

Kids = getgca.Children;

% Number = findobj(Kids','Type','text')

Lines = findobj(Kids, 'Type','line');

for k = 1:numel(Lines) % Match Markers To 'Lines' Indices

if strcmp(Lines(k).Marker, 'x')

Poles = k;

elseif strcmp(Lines(k).Marker, 'o')

Zeros = k;

elseif strcmp(Lines(k).Marker, 'none')

UnitCircle = k;

end

% Poles

% Zeros

% UnitCircle

Lines(Poles).Color = 'g';

Lines(Poles).LineWidth = 2;

Lines(Zeros).Color = 'm';

Lines(Zeros).LineWidth = 1.5;

This looks up the markers, saves the appropriate indices, and then does the appropriate assignments. You can change the ‘UnitCircle’ properties as well, if you want to. The same syntax works.

The ‘2’ is a separate text object. (This can be seen by removing the semicolon from the end of the ‘Kids’ assignment.) You would have to add that to your plot using roots. It always appears to be the first entry, so you can either refer to it as ‘Kids(1)’ or do:

Number = findobj(Kids','Type','text')

I added it (to be certain that it does what I want it to do) and then commented it out. Un-comment it to explore its properties to see how that text call works.

.

Star Strider 2023-11-4

Thank you!

It is easier, however it appears that the line objects do not always appear in the same order, for whatever reason. If you want them to all be the same colours and sizes, the first solution is easier. If you want them to be specifically different, the strcmp approach is necessary. It all depends on what you want.

Konstantinos 2023-11-4