how to plot only one datapoint at a time with a 1 second delay from a dataset

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Heraldo Tello 2020-10-21

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https://ww2.mathworks.cn/matlabcentral/answers/621948-how-to-plot-only-one-datapoint-at-a-time-with-a-1-second-delay-from-a-dataset

评论： Heraldo Tello 2020-10-22

Hello everyone,

I have a matrix made of 3 columns and a random number of rows (for example TestPoints=[1 4 6;2 1 4;3 2 3;4 1 5;5 3 4;6 1 6;7 2 6;8 2 6];). I want to plot the second and third column (will call these X & Y). I do not care about the first column. The first column could be thought as time in seconds and the second and third coumns are Measurement 1 and Measurement 2 respectively.

However, I want to plot the first X and Y point first, followed by a 1 second delay before it plots the next X and Y point. I want it to keep doing this until it has gone through every row. Note: I do not want the previous point to show on the plot when the new point is plotted.

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Answer 1

the cyclist 2020-10-21

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https://ww2.mathworks.cn/matlabcentral/answers/621948-how-to-plot-only-one-datapoint-at-a-time-with-a-1-second-delay-from-a-dataset#answer_520858

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Here is one way:

TestPoints=[1 4 6;2 1 4;3 2 3;4 1 5;5 3 4;6 1 6;7 2 6;8 2 6];
figure
for nr = 1:size(TestPoints,1)
    plot(TestPoints(nr,2),TestPoints(nr,3),'.','MarkerSize',40);
    set(gca,'XLim',[min(TestPoints(:,2)),max(TestPoints(:,2))],'YLim',[min(TestPoints(:,3)),max(TestPoints(:,3))])
    pause(1)
end