Animation using plot inside for loop

I am trying to create an animation by using the plot function inside of a for loop. No matter what I do, I just get back the same still figure that opens. This figure opens over and over again when I close it.

 figure(5)
for n = 1:1000
    pos = xout(n,1)
    x_origin = 0;
    y_origin = 0;
    x_bob = 0.75*sin(pos);
    y_bob = -0.75*cos(pos);
    plot([x_origin,x_bob],[y_origin,y_bob])
    axis equal
    xlim([-2 2])
    ylim([-2 2])
    drawnow
end

'xout' is a matrix with the angle values of a pendulum in the first column.

[Kevin Chng]

Hi, kindly try

 figure(5)
for n = 1:100
    x_origin = 0;
    y_origin = 0;
    x_bob = 0.75*sin(n);
    y_bob = -0.75*cos(n);
    plot([x_origin,x_bob],[y_origin,y_bob])
    axis equal
    xlim([-2 2])
    ylim([-2 2])
    drawnow
end

I recommend you to take a look at xout() function. it is either updating too slow or something error within it.

[Image Analyst]

I get a line swinging around like hands on a clock. Maybe put a pause(0.1) at the bottom of the loop to slow it down if you can't see it move.

[Stephen Wilkerson]

Yes this: works fine as a .m file, but if put in a live script does not work, is there a way to animate a live script?

figure(5)

for n = 1:100

x_origin = 0;

y_origin = 0;

x_bob = 0.75*sin(n);

y_bob = -0.75*cos(n);

plot([x_origin,x_bob],[y_origin,y_bob])

axis equal

xlim([-2 2])

ylim([-2 2])

drawnow

end

Answer 1

[ANKUR KUMAR]

clc
clear
h=figure
for n = 1:10
    x_origin = 0;
    y_origin = 0;
    x_bob = 0.75*sin(n);
    y_bob = -0.75*cos(n);
    plot([x_origin,x_bob],[y_origin,y_bob])
    axis equal
    xlim([-2 2])
    ylim([-2 2])
    make_animation( h,n,'sample_animation.gif' )
    pause(0.2) %you can enter the time in pause to change the loop
end

function make_animation( h,index,filename )
drawnow
frame = getframe(h);
im = frame2im(frame);
[imind,cm] = rgb2ind(im,256);
if index == 1
    imwrite(imind,cm,filename,'gif', 'Loopcount',inf);
else
    imwrite(imind,cm,filename,'gif','WriteMode','append');
end
end

If you are using older version than 2016a, then write make_animation in separate function and then run the program, as older version of MATLAB doesn't support writing functions inside in the script.

[Carlos Eduardo Gonzalez Pabon]

How can I speed up the animation?

[Rahul Wadhwani]

@Carlos Eduardo Gonzalez Pabon you can change the value in pause() to speed up or slow down your animation.