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animated sine wave continously

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nirwana on 30 Mar 2023
Commented: Les Beckham on 31 Mar 2023
Hi alll, i'd like to make sine wave with three variation and walk continously, but i end up make it uncontinously,
here the script that i modified, any suggestion to solve it?
close all
t = 0:0.01:10*pi;
y = cos(t+phase);
for j = 1:length(t)
hold on
hold off
axis([0 8*pi -2 2]) % moving 2 cycles would mean the end would be 4pi + 2*2pi = 8pi
% you can keep the axis endpoints according to your need
grid on
%hold on
if j ~= length(t)
t = t + 0.1; % used 0.1 increment as elements in t have 0.1 difference
% Also, as y is already defined earlier, this change in t will not change y
  1 Comment
Adam Danz
Adam Danz on 30 Mar 2023
@nirwana, creating an animation by iteratively calling plot() is very inefficient. In your demo, three lines are created and and eliminated over 3000 times. Instead, re-use the same line(s) and update the values on each iteration. @Les Beckham demonstrates this in the answer below.
Another approach is to use animatedline.

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Accepted Answer

Les Beckham
Les Beckham on 30 Mar 2023
Edited: Les Beckham on 30 Mar 2023
This should get you started. Adjust as desired.
Note that the animation won't show here, but I tested it my local copy of Matlab.
t = linspace(0, 4*pi, 1000);
y = sin(t);
hl = plot(t, y);
grid on
xlim tight
ylim padded
for i=1:1000
set(hl, 'YData', circshift(get(hl, 'YData'), 1))
% you may want -1 here ^
% depending on which direction you want to scroll

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