Plot interval in y

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?

[Dyuman Joshi]

It's not clear to me what you want to do.

Could you elaborate on this and provide more information? An example alongside would be helpful.

[Maria]

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]

"but they told me that I need to limit the schedule by f"

I do not understand this. Can you explain a bit more about this?

Also, do you know what is the expected output? If yes, then please share.

Answer 1

[Sam Chak]

Hi @Maria

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]

Thank you it works @Sam Chak

[Sam Chak]

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;