how can i make this animation faster in MATLAB?

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Jason Robert 2020-11-21

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/656258-how-can-i-make-this-animation-faster-in-matlab

编辑： CHENG QIAN LAI 2020-11-26

r = 1; 
hmax = 28; 
n = 1000;
h = linspace(0,hmax,n);
t = linspace(0,360,n);
k = 0;
pt = 1/6000;
x = zeros(length(h),length(t));
vx = x;
y = x;
vy = y;
a = r+h;
b = r+hmax/2*(cosd(t).^2)+hmax/2;
for i = 1:n
    x(i,:) = a(i)+r.*cosd(t);
    y(i,:) = b(i)+r.*sind(t);
    vx(i,:) = r+r.*cosd(t);
    vy(i,:) = r+h.*sind(t);
end
figure(3)
ball_bounce1= plot(x,y,'c');
axis([-1 31 -1 31])
grid on 
while k < 10 
    if rem(k,2) == 0 
        for i = 1:n
            set(ball_bounce1,'XData',x(i,:),'YData',y(i,:));
            pause(pt)
        end
    end
    if k > 10 
    break
    end
   
end

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Rik 2020-11-21

I'm not sure that is possible. You could replace the pause with drawnow, but that shouldn't meaningfully impact code performance. Seeing your code, I expect only lowering the requirements or increasing hardware will work. Do you need every iteration?

Jason Robert 2020-11-21

also is there a way you can help me make the code into cos^2 animation

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采纳的回答

VBBV 2020-11-21

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https://ww2.mathworks.cn/matlabcentral/answers/656258-how-can-i-make-this-animation-faster-in-matlab#answer_552013

编辑：VBBV 2020-11-21

hmax = 25; % max height
n = 100; % make this value smaller
h = linspace(0,hmax,n);
t = linspace(0,360,n);
k = 0;
pt = 1/6000; % 
...
    
figure(3)
ball_bounce1= plot(x,y,'c','linewidth',3);

Use the values above and try again

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VBBV 2020-11-22

编辑：VBBV 2020-11-22

change this line in your program , i think it works for n = 1000 also

figure(3)
ball_bounce1= plot(x(1:500:end),y(1:500:end),'c','linewidth',3);

VBBV 2020-11-25

You can also use fanimator function for animating circle. See the resource below

https://in.mathworks.com/help/symbolic/fanimator.html

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更多回答（2 个）

per isakson 2020-11-22

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https://ww2.mathworks.cn/matlabcentral/answers/656258-how-can-i-make-this-animation-faster-in-matlab#answer_552283

编辑：per isakson 2020-11-22

"[...] to make a ball bounce back and forth between to walls" This is as fast as it gets - I think (with m-code)

%%
x=1;y=1;
ball_bounce1= plot(x,y,'o');
ball_bounce1.MarkerSize = 24;
axis([-1 31 -1 31])
grid on
N = 400;
for jj = 1 : N
    set( ball_bounce1,'XData',jj*30/N, 'YData',jj*30/N );
    drawnow    
end

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CHENG QIAN LAI 2020-11-26

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/656258-how-can-i-make-this-animation-faster-in-matlab#answer_557018

编辑：CHENG QIAN LAI 2020-11-26

% If you draw x,y ,you will get 1000 Line objects.
% (ball_bounce1=1000 Line obj)
ball_bounce1= plot(x,y,'c');
numel( ball_bounce1 )  
% Set all line objects(ball_bounce1) to same position, this will slow down the program.
set(ball_bounce1,'XData',x(i,:),'YData',y(i,:));

r = 1; 
hmax = 28; 
n = 1000;
h = linspace(0,hmax,n);
t = linspace(0,360,n);
phi = linspace(0,360,50);  % Reduce array elements
k = 0;
pt = 1/6000;
x = zeros(length(h),length(phi));
vx = x;
y = x;
vy = y;
a = r+h;
b = r+hmax/2*(cosd(t).^2)+hmax/2;
x = a'+ r.*cosd(phi);
y = b'+ r.*sind(phi);
%for i = 1:n
    %x(i,:) = a(i)+r.*cosd(phi);
    %y(i,:) = b(i)+r.*sind(phi);
    %vx(i,:) = r+r.*cosd(t);
    %vy(i,:) = r+h.*sind(t);
%end
figure;
ball_bounce1= plot(0,0,'c');  % ball_bounce1 = 1x1 Line
line(a,b);
axis([-1 31 -1 31])
grid on 
step=1;
k=1;
while k < 10
    
    for i = 1:step:n  % You can try step = 2
        set(ball_bounce1,'XData',x(i,:),'YData',y(i,:));
        pause(pt)  % or  drawnow
    end
    k=k+1;
end