# Plot interval in y

2 views (last 30 days)
Maria on 22 Nov 2023
Commented: Sam Chak on 22 Nov 2023
Hello, the question is, is it possible to set an interval in y when plotting a graph, if the interval is already set in x?
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Maria on 22 Nov 2023
I have a task to build a graph of a trigonometric equation (cos(2*t))^(-2) - (sin(2*t))^(-2) =8/3), I build the graph as follows (I will attach part of the program) , but they told me that I need to limit the schedule by f, but I didn’t find information about this
t = 0:0.01:3*pi;
f= (cos(2*t)).^(-2) - (sin(2*t)).^(-2) - 8/3;
figure;
plot(t, f, 'LineWidth', 2);
xlabel('t');
ylabel('y');
title('График уравнения');
grid on;
Dyuman Joshi on 22 Nov 2023
"but they told me that I need to limit the schedule by f"
Also, do you know what is the expected output? If yes, then please share.

Sam Chak on 22 Nov 2023
The ylim() command can be used to set the interval on the y-axis.
x = -1:0.01:1;
y = x.^3 - 0.25*x.^2 - 0.5*x;
figure (1)
plot(x, y), grid on
figure (2)
plot(x, y), grid on, ylim([-0.4, 0.2])
Maria on 22 Nov 2023
Thank you it works @Sam Chak
Sam Chak on 22 Nov 2023
You are welcome, @Maria. If you find the solution helpful, please consider clicking 'Accept' ✔ on the answer and voting 👍 for it.
By the way, the function has singularities (division-by-zero events). That's why the plot shows the discontinuities.
t = 0:0.01:3*pi;
f = (cos(2*t)).^(-2) - (sin(2*t)).^(-2) - 8/3;
figure;
plot(t, f, 'LineWidth', 2);
ylim([-20 20])
xlabel('t');
ylabel('y');
title('График уравнения');
grid on;

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