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 个评论
>so I'm thinking maybe I used the wrong variable for i?
Kindly. The direction of the iterator is from negative (smaller one) to positive (larger one).
L = 2 ;
g = 9.81 ;
Theta_0 = pi/3;
t = 2*pi*sqrt(L/g);
Theta = Theta_0 * cos(sqrt(g/L) * t)
N_Theta = -1 * Theta
for i = Theta:N_Theta
i
end
% Nothing hapen here
for i = N_Theta:Theta
i
end
Because your iterator omits writing increments. The omitted increment becames "+1".
Theta = 1.0472;
N_Theta = -Theta;
for i = Theta:1:N_Theta
i % Nothing hapen
end
for i = Theta:-1:N_Theta
i
end
for i = N_Theta:-1:Theta
i % Nothing hapen
end
for i = N_Theta:1:Theta
i
end
VBBV
2022-4-10
The figure you have shown might have obtained with another tool, but not using the code you've posted
Isabelle Davies
2022-4-10
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