Hi I'm trying to plot using a for loop. don't see syntax errors but plot comes out empty. appreciate your guidance.

2022 2 1
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更新时间：2022 2 2
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for t = 0:30/100:30
y1 = 6*exp(-0.2)*t*sin(7*t+3);
y2 = 4*exp(-0.1)*t*sin(3*t-1);
end
plot(y1,t);
hold on;
plot(y2,t);
hold off;
legend ('y1(t)=6e^-0.2tsin(7t+3)','y2(t)=4e^-0.1tsin(3t-1)');
axis([0 30 -6 6])

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Voss
Voss 2022-2-1
Ran in:

0 个投票

Ran in:
The plot comes out empty because you're only plotting the last point. Try it like this:
t = 0:30/100:30;
y1 = 6*exp(-0.2)*t.*sin(7*t+3);
y2 = 4*exp(-0.1)*t.*sin(3*t-1);
plot(y1,t);
hold on;
plot(y2,t);
hold off;
legend ('y1(t)=6e^-0.2tsin(7t+3)','y2(t)=4e^-0.1tsin(3t-1)');
axis([0 30 -6 6])

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Wesley Lei
Wesley Lei 2022-2-1
Great. it works now. Thanks so much. so i can use for loop? the assignment asks to practice loops.
Voss
Voss 2022-2-1
Ran in:
Ran in:
Yeah, you can use a for loop:
t = 0:30/100:30;
y1 = zeros(size(t));
y2 = zeros(size(t));
for i = 1:numel(t)
y1(i) = 6*exp(-0.2)*t(i)*sin(7*t(i)+3);
y2(i) = 4*exp(-0.1)*t(i)*sin(3*t(i)-1);
end
plot(y1,t);
hold on;
plot(y2,t);
hold off;
legend ('y1(t)=6e^-0.2tsin(7t+3)','y2(t)=4e^-0.1tsin(3t-1)');
axis([0 30 -6 6])
Image Analyst
Image Analyst 2022-2-2
Can you click the "Accept this answer" link to give him his "reptuation points"?

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