MATLAB: Plotting position every 10 secound

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I have this code that plots two objects moving around. I would like to add such that it marks the position of both objects for every 10-20 times it runs through. How Do I do that?
axis([-0,400,-200,200])
hold on
% Data
x1 = squeeze(x_V);
y1 = squeeze(y_V);
N1 = NaN(size(x1));
x2 = squeeze(x_O);
y2 = squeeze(y_O);
N2 = NaN(size(x2));
% Create the line and get its X and Y data
h1 = plot(N1, N1);
h2 = plot(N2, N2);
xdata1 = get(h1, 'XData');
ydata1 = get(h1, 'YData');
xdata2 = get(h2, 'XData');
ydata2 = get(h2, 'YData');
for k = 1:length(x1)
    xdata1(k) = x1(k);
    ydata1(k) = y1(k);
    xdata2(k) = x2(k);
    ydata2(k) = y2(k);
    % Update the plot
    set(h1, 'XData', xdata1, 'YData', ydata1, 'Color', 'red');
    set(h2, 'XData', xdata2, 'YData', ydata2, 'Color', 'blue');
    drawnow
end

Best Answer

Adding this after the first loop gave me somehow the result that I needed, but it is not a nice piece of code..
axis([-0,400,-200,200])
hold on
% Data
x1 = squeeze(x_V);
y1 = squeeze(y_V);
N1 = NaN(size(x1));
x2 = squeeze(x_O);
y2 = squeeze(y_O);
N2 = NaN(size(x2));
% Create the line and get its X and Y data
h1 = plot(N1, N1);
h2 = plot(N2, N2);
xdata1 = get(h1, 'XData');
ydata1 = get(h1, 'YData');
xdata2 = get(h2, 'XData');
ydata2 = get(h2, 'YData');
for k = 1:length(x1)
    xdata1(k) = x1(k);
    ydata1(k) = y1(k);
    xdata2(k) = x2(k);
    ydata2(k) = y2(k);
    % Update the plot
    set(h1, 'XData', xdata1, 'YData', ydata1, 'Color', 'red');
    set(h2, 'XData', xdata2, 'YData', ydata2, 'Color', 'blue');
      drawnow
  end
for k = 1:100:length(x1)
    xdata1(k) = x1(k);
    ydata1(k) = y1(k);
    xdata2(k) = x2(k);
    ydata2(k) = y2(k);
      plot(xdata1(k),ydata1(k),'ro')
      plot(xdata2(k),ydata2(k),'bo')
  end
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