# Trouble making my for loop work

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I'm trying to simulate the movement of a pendulum by plotting a line and a marker, and then using a for loop:

L = 2 ;

g = 9.81 ;

Theta_0 = pi/3

t = 2*pi*sqrt(L/g)

cos(sqrt(g/L) * t);

Theta = Theta_0 * cos(sqrt(g/L) * t)

N_Theta = -1 * Theta

x = L * sin(Theta) ;

y = L * (1 - cos(Theta)) ;

figure(1)

hold on

axis equal

axis([-2,2,-0.5,3.5]);

for i = 1:length(t)

plot([0 x(i)], [2 y(i)], '-', 'LineWidth', 6, 'Color', 'k');

plot(x(i), y(i), 'b.', 'Markersize', 70)

drawnow

pause(0.1)

end

hold off

Ok so I've got the i thing figured out (thanks to those in the comments for your help), but now I'm trying to figure out how to make it so that I can actually see the different plotted pendulums without them stacking on top of each other. I'm pretty certain it's got to do with my placement of hold on and hold off, but I can't figure out what the right position is.

Sorry if this is really basic stuff or I've made an obvious mistake, I'm a beginner and just trying my best.

Thanks!

##### 4 Comments

VBBV
on 10 Apr 2022

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