Dynamic plot in each iteration in MATLAB

Question

In the following code, plot(plot_x,plot_y,'-k'); in current iteration shows the previous iterations plots.

But I want to show only the current iteration plot, i.e., previous plot should be disappeared. However, plot(N_x,N_y,'Ob','MarkerSize',10); should be there always. What kind of modification should I do?

N = 50;
L = 20;
itr = 5;
N_x = (rand(N,1)-0.5)*L;
N_y = (rand(N,1)-0.5)*L;
plot(N_x,N_y,'Ob','MarkerSize',10);
grid on;
hold on;
axis([-0.5*L 0.5*L -0.5*L 0.5*L]);
for n = 1:itr
    out = randperm(N,5);
    plot_x = N_x(out);
    plot_y = N_y(out);
    plot(plot_x,plot_y,'-k');
    hold on;
    pause(1);
end

Wolfie · Accepted Answer · 2021-09-29 07:09:08Z

3

You can update the XData and YData properties of a single line instead of creating a new one.

I've added comments to the below code to explain the edits

N = 50;
L = 20;
itr = 5;
N_x = (rand(N,1)-0.5)*L;
N_y = (rand(N,1)-0.5)*L;
plot(N_x,N_y,'Ob','MarkerSize',10);
grid on;
hold on;
axis([-0.5*L 0.5*L -0.5*L 0.5*L]);
p = plot(NaN, NaN, '-k'); % Create a dummy line to populate in the loop
for n = 1:itr
    out = randperm(N,5);
    plot_x = N_x(out);
    plot_y = N_y(out);
    set( p, 'XData', plot_x, 'YData', plot_y ); % Update the line data
    drawnow(); % flush the plot buffer to force graphics update
    pause(1);
end

answered Sep 29, 2021 at 7:09

Wolfie

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Comments

il_raffa · Accepted Answer · 2021-09-29 07:09:32Z

1

In the plot loop, ask the plot function returnig the handle of the line, then, after the pause statement delete the line by calling the delete function.

for n = 1:itr
    out = randperm(N,5);
    plot_x = N_x(out);
    plot_y = N_y(out);
    %   
    % Get the handle of the line
    %
    hp=plot(plot_x,plot_y,'-k');
    hold on;
    pause(1);
    %   
    % Delete the line
    %
    delete(hp)
end

answered Sep 29, 2021 at 7:09

il_raffa

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