Dynamic plot in each iteration in MATLAB-CodePudding

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

CodePudding user response：

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

CodePudding user response：

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