how to display an output on a plot itself?

Hi friends,

for this code:

x = linspace(-5,2);

y = -x-3;

z = 2*x

figure(1)

plot(x, y)

hold on

plot(x, z)

legend('x','y','location','best')

ix = interp1(y-z,x,0)

How can I cahnge this code and what coding line I should add so the solution (intersection point of y and z function, i.e., ix = -1) be displayed on the plot itself in a box?

Thank you

Answer 1

[Sam Chak]

Hi @Mohiedin Bagheri

Do you want to plot something like this?

x = linspace(-5, 2, 701);
y = - x - 3;
z = 2*x;
figure(1)
plot(x, y)
hold on
plot(x, z)
ix = interp1(y-z, x, 0);
iy = 2*ix;
plot(ix, iy, 'o', 'markersize', 15, 'linewidth', 3)
xlabel('x'), grid on
legend('y', 'z', 'location', 'best')
txt = ['\leftarrow intersection: x = ' num2str(ix)];
text(-1+0.25, -2, txt)

[Mohiedin Bagheri]

Thank you for your reply. @Sam Chak

I meant the answer to this equation (y = z) which is "x = -1" be desplayed on the plot. Is there anyways to modify the code so the output for "ix = interp1(y-z, x, 0)" be displayed on the plot?

[Sam Chak]

You are welcome, @Mohiedin Bagheri. I have edited my Answer above according to your description. If you find the MATLAB code is helpful, please consider accepting ✔ and voting 👍 the Answer. Thanks a bunch! 🙏

[Mohiedin Bagheri]

@Sam Chak Thank you very much Sam. I appreciate your help.

All done! Voted and Accepted the Answer :)

Thanks buddy

[Sam Chak]

@Mohiedin Bagheri, Don't mention it. Who knows I'll need your help in future.

Answer 2

[Abhinav]

Here is the link to find the intersection point of two line segments/lines. A fast two line intersection point finder based on the line parametric space. Finds the intersection point between two lines if it exists or else submits NaN.