Issue with sine graph

Question

Kaylee Chavez 2021-5-22

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/837063-issue-with-sine-graph

评论： DGM 2021-5-23

I am having some difficulty graphing a function using sine. I graph it and it is either a y =x type graph or just lines. If someone could provide some direction that would be great.

%Oblique Balance Script
figure('Name','Team A Graphs');
clf;      
%%Weight Ratio
subplot(2,1,1)
t=[0:0.01:180]
r = sind(30 + t) ./ sind(30 - t);
plot(t, r);
area(t,r,'FaceColor',[.8,.9,1.0]);
%Weight Graph
title('Weight ratio')
xlabel('Angle change')
ylabel('Ratio')

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Answer 1

Sulaymon Eshkabilov 2021-5-22

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https://ww2.mathworks.cn/matlabcentral/answers/837063-issue-with-sine-graph#answer_706063

在 MATLAB Online 中打开

Hi,

If you're trying to plot the weight ratio explained in your previous post, that has to be up to 30 degrees.

Thus, you'd need to make some corrections in your code while selecting the range t values, e.g.:

...
t=0:.25:29;
...

Note that at t=30, y goes to inf.

Good luck.

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DGM 2021-5-23

在 MATLAB Online 中打开

For emphasis:

t=[0:0.01:180];
r = sind(30 + t) ./ sind(30 - t); % the denominator goes to zero.  
plot(t, r);
area(t,r,'FaceColor',[.8,.9,1.0]);
ylim([-100 100]) % so explicitly limit y limits