MATLAB: How to define line colour in zplane plotting

plotplotting

I have used the command; zplane to plot a graph and i wanted to change the line colour but still i am struggling…… if someone know how to do this please let me know!!!

Thank you, Ishan

Best Answer

Thank you Walter Roberson and Matt Fig !!!

Walter I tried your code but it plots unit circle red and y axis green. since I wanted to plot zeros and poles in colours,I manage to modify the your code as;

figure(2) % Z-plane poles and zeors 
[hz1, hp1, ht1] = zplane(a,b); % Plot zeros and poles when coefficients are unquantized
 grid on;% turn on grids 
hold on;% Plot the second graph in same figure 
[hz2, hp2, ht2] = zplane(H_Ka,H_Kb);%Plot zeros and poles when coefficients unquantized
 hold off;
set(findobj(hz1, 'Type', 'line'), 'Color', 'g'); 
set(findobj(hp1, 'Type', 'line'), 'Color', 'g');
set(findobj(hz2, 'Type', 'line'), 'Color', 'r');
set(findobj(hp2, 'Type', 'line'), 'Color', 'r');

Thank you again Walter !! Cheers !!!

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MATLAB: How to define the own colororder for a bodeplot

The function "bodeplot" defaults to colors specified in MATLAB. If you try to set a color order when using the "hold on" command, for each new plot, MATLAB uses the first value in the color order. In order to work around this, you will need to set the line colors to custom RGB values using the handles associated with the line objects. First you will have to obtain these handles associated with the line plots and then set their 'Color' property. You can find the handles associated with each line on the plot using the command:

lineHandle = findobj(gcf,'Type','line','-and','Color','b');

Here, the function "findobj" looks for objects in the figure of type "line" and color "b", and then obtains their handles.

Once you have these handles, you can then change the line color as per your requirements. You can do this by using the command:

set(lineHandle,'Color',col(ii,:));

The variable "col" contains the color order defined by "copper".

For more information on "findobj" please see: findobj

Here's a sample version of the code you want to execute:

    % Define the models
    sys{1} = tf([1],[2 1]) % Define one system
    sys{2} = tf([2],[2 3 1]) % Define another system
    % Define the color order based on the number of models
    col = copper(numel(sys)); %
    % Set the color to the color order you want
    for ii = 1:numel(sys)
        % Default the new plot color to blue
        bodeplot(sys{ii},'b');
        % Find handles of all lines in the figure that have the color blue
        lineHandle = findobj(gcf,'Type','line','-and','Color','b');
        % Change the color to the one you defined
        set(lineHandle,'Color',col(ii,:));
        % Hold on
        hold on
    end
    % Hold off
    hold off;

MATLAB: Plot pole-zero using the MATLAB function zplane.

zplane([1, -5.5216, 13.1528, ...], [1, -4.9694, 10.6536, ...])

Best Answer

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MATLAB: How to define the own colororder for a bodeplot

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