Plotting Intersection point on plot

Hello, I simply have a plot here, but everytime I run the code, I want my plot to include the point where the two lines intersect. Just simply show the intersection point and it's coordinates on the plot. Was hoping there was a way to do this instead of having to click on the intersection point with mouse.

Answer 1

[Star Strider]

Try this:

Cpo = -0.75;a = 3.32;
M = 0.2:0.01:0.8;
Cp = Cpo./sqrt(1-M.^2);

Cp_cr = 2./(a*M.^2) .* ((((2+(a-1)*M.^2)/(a+1)) .^(a/(a-1)))-1);

xisx = interp1((Cp - Cp_cr), M, 0);
yisx = Cpo./sqrt(1-xisx.^2);

figure
plot(M, Cp)
hold on
plot(M, Cp_cr)
plot(xisx, yisx, 'pg', 'MarkerFaceColor','g')
hold off
set(gca, 'YDir','reverse')
legend('Cp', 'Cp\_cr', 'Intersection')

It would have been easier wit your actual code, rather than aan image of it.

.

[Mayowa Milburn]

Hi can you do that for simple cases of x=[1 2 3 4 5], y1=[2 4 6 8 10], y2=[3 6 9 12 15]

plot(x,y1)

plot(x,y2)

How do you apply that code to find and plot the intersect in this case?

Answer 2

[Ameer Hamza]

You may also have look at this FEX package: https://www.mathworks.com/matlabcentral/fileexchange/22441-curve-intersections.