Plot in real time
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I want to take a 2-dimensional vector and plot it, but I want to show the line being drawn as if the data is being gathered in real time. However, I'll have the data already stored in an array.
For example, if I wanted to plot y = sin(x) from x = 1 to 25, then I would use the following command:
plot(sin(1:0.01:25));
But I want to see the curve being drawn as if it's being done in real-time. How would I do this?
采纳的回答
the cyclist
2013-7-25
One possible way:
x = 1:0.01:25;
y = sin(x);
n = numel(x);
figure
hold on
for i = 1:n
plot(x(1:i),y(1:i))
xlim([0 25])
ylim([-1.1 1.1])
pause(0.05)
end
4 个评论
Caleb
2013-7-25
the cyclist
2013-7-25
It is actually better outside the loop, as long as it is before the plotting. So, this is slightly more efficient:
x = 1:0.01:25;
y = sin(x);
n = numel(x);
figure
xlim([0 25])
ylim([-1.1 1.1])
hold on
for i = 1:n
plot(x(1:i),y(1:i))
pause(0.05)
end
Alireza Madani
2022-4-30
Does anyone know how can we program this scenario in a way that the speed of the while/for loop is controller with the real time? For example if we want to plot y = sin(t) and t = 0 : 0.01 : 25. It actually takes 25 seconds for the MATLAB to plot this.
Khang Nguyen
2023-9-7
Hi, can you graph multiple plots live at the same time?
更多回答（1 个）
Anshul Rathore
2019-3-25
Don't use hold on instead use drawnow function to update your plots as it is much faster.
x = 1:0.01:25;
y = sin(x);
n = numel(x);
figure;
for i = 1:n
plot(x(1:i),y(1:i),'-r');
xlim([0 25]);
ylim([-1.1 1.1]);
drawnow;
end
2 个评论
Jonathan Arias
2021-5-22
you have to add this line (before drawnow):
addpoints(an,x(i),y(i));
More examples: https://la.mathworks.com/help/matlab/ref/drawnow.html
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