How to find point of intersection ?

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thineesh Vijayakumar 2019-4-12

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https://ww2.mathworks.cn/matlabcentral/answers/456049-how-to-find-point-of-intersection

评论： Star Strider 2019-4-12

I have 4 coordinate and need to find the point of intersection. Can someone share the coding to find the intersection point and to display the point in graph below. Thank You.

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Star Strider 2019-4-12

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https://ww2.mathworks.cn/matlabcentral/answers/456049-how-to-find-point-of-intersection#answer_370403

在 MATLAB Online 中打开

Try this:

blue = [1 5; 1 5];                      % [x1 x2; y1 y2] 
red = [1 5; 3 2];                       % [x1 x2; y1 y2] 
Bb = [blue(1,:)' ones(2,1)] \ blue(2,:)'
Br = [red(1,:)' ones(2,1)] \ red(2,:)'
xint = (Br(2) - Bb(2)) / (Bb(1) - Br(1))
yint = [xint 1] * Bb
figure
plot(blue(1,:)', blue(2,:)', '-b')
hold on
plot(red(1,:), red(2,:), '-r')
plot(xint, yint, 'pg', 'MarkerSize',10)
hold off