Question

matlab画动态图

function[]=main()
N=50;t=0:0.0001;x=0:0.21:20;
w= Sum(N,t(1));
h=plot(x,w,'linewidth',5);
axis([0,20,0,1.5]);
for n=2:length(t)
w=Sum(N,t(n));
set(h,'ydata',w);
drawnow;
pause(0.1)
end
function u=Sum(N,t)
x=0:0.21:20;u=0;
for k=1:2*N
u=u+exp(-(k^2*pi^2*10^2/400*t))*2/k/pi*(cos(k*pi*10/20)-cos(k*pi*11/20))*sin(k*pi*x./20);
end
这个程序画出的应该是一个关于时间t的动态图，结果是一个静态图，求高手解答

Answer 1

function[]=main()
N=50;t=0:0.0001;x=0:0.21:20; 这里t=0:0.0001:1

w= Sum(N,t(1));
h=plot(x,w,'linewidth',5);
axis([0,20,0,1.5]);
for n=2:length(t)
w=Sum(N,t(n));
set(h,'ydata',w);
drawnow;
pause(0.1)
end
function u=Sum(N,t)
x=0:0.21:20;u=0;
for k=1:2*N
u=u+exp(-(k^2*pi^2*10^2/400*t))*2/k/pi*(cos(k*pi*10/20)-cos(k*pi*11/20))*sin(k*pi*x./20);
end

追问

请问这个动画如何保存

追答

function[]=main()
N=50;
t=0:0.0001:0.005; %这里改小了点 避免视频文件过大

x=0:0.21:20;

aviobj=avifile('test'); %定义一个视频文件用来存动画

aviobj.quality=60;
aviobj.Fps=5;

w= Sum(N,t(1));
h=plot(x,w,'linewidth',5);
axis([0,20,0,1.5]);
for n=2:length(t)
w=Sum(N,t(n));
set(h,'ydata',w);
drawnow;

frame=getframe(gca); %把图像存入视频文件中

im=frame2im(frame);
aviobj=addframe(aviobj,im);

pause(0.1)
end
aviobj=close(aviobj);

function u=Sum(N,t)
x=0:0.21:20;u=0;
for k=1:2*N
u=u+exp(-(k^2*pi^2*10^2/400*t))*2/k/pi*(cos(k*pi*10/20)-cos(k*pi*11/20))*sin(k*pi*x./20);
end