How to plot x^2 - y^2 = 1?

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Niklas Kurz 2020-11-14

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https://ww2.mathworks.cn/matlabcentral/answers/648033-how-to-plot-x-2-y-2-1

评论： Niklas Kurz 2021-11-3

采纳的回答： Star Strider

Very simple question to understand I think.

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Star Strider 2020-11-14

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Try this:

syms x y 
figure
fimplicit(x^2 + y^2 -1, [-1 1])
axis('equal')

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Star Strider 2020-11-16

As always, my pleasure!

Note that ‘<1’ includes everything from infinitesimally less than +1 to -Inf.

Niklas Kurz 2021-11-3

在 MATLAB Online 中打开

Digging this out again, how about

A kind of solution would go like:

[x,y] = meshgrid(-4:0.008:4);
u = y;
v = x;
w = zeros(size(u));
 D1 = (x.^2+y.^2)>1;
 D2 = (x.^2+y.^2)<4;
u(~D1) = NaN;
u(~D2) = NaN;
 
mesh(u,v,w)

But are there other ones, for instance with the aid of a countour plot?

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Image Analyst 2020-11-14

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https://ww2.mathworks.cn/matlabcentral/answers/648033-how-to-plot-x-2-y-2-1#answer_544758

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Try this:

% x^2 - y^2 = 1
% Or y = sqrt(x^2 - 1)
x = linspace(-2, 2, 1000);
y = sqrt(x .^ 2 - 1);
plot(x, y, 'b-', 'LineWidth', 2);
title('y = sqrt(x .^ 2 - 1)', 'FontSize', 15, 'Interpreter', 'none');
xlabel('x', 'FontSize', 15);
ylabel('y', 'FontSize', 15);
grid on;