How to plot 2 lines and find the coordinates of their intersection? (2024)

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Swati Umamaheshwaran am 17 Sep. 2017

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Beantwortet: Preetham Manjunatha am 8 Feb. 2022

I need to plot the lines x+y=3 and x-y= -1 and find their point of intersection. I know that to plot the lines I could use 'fplot'. How can I find the coordinates of their intersection and plot it? Please help.

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Star Strider am 17 Sep. 2017

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Another approach:

xymtx = [1 1; 1 -1];

cv = [3; -1];

xy = xymtx\cv; % Calculate Intercept

xint = xy(2); % X-Value Of Intercept

yint = xy(1); % Y-Value Of Intercept

xyind = [xint - 1, xint + 1]'; % X-Values For Plot

xydep = [cv -xyind.*xymtx(:,2)]; % Y-Values For Plot

figure(1)

plot(xyind, xydep(1,:), xyind, xydep(2,:), '-r')

hold on

plot(xint, yint, 'pg', 'MarkerFaceColor','g', 'MarkerSize',10)

hold off

This is straightforward and relatively simple linear algebra. The ‘xydep’ variable calculates the y-values corresponding to the arbitrary values in ‘xydep’, and is the result of solving ‘[X + Y] = C’ for ‘Y’.

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Tutku Oztel am 9 Jan. 2019

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Hello,

I'm sharing the function that I wrote to find the intersection points of two lines with their given slope and constant values:

function [x0 y0] = intersectPoints(m1,m2,b1,b2)

% Insersection point of two lines with known slope and constant

% parameters.

% [x0 y0] = intersectPoints(m1,m2,b1,b1)

% where m's are slope, and b's are constants.

% written by Tutku Öztel in 06.01.2019

x0 = (b2-b1)/(m1-m2); %find the x point

y0 = m1*x0+b1;

end

Late though, but still.. Hope it will be helpful! :)

Tutku

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José Luis Sandoval am 7 Jun. 2020

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Usefuil, thanks.

Wai Keong Bryce Wong am 12 Okt. 2020

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This is super useful. Thanks for your help!

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Simon Kölbl am 17 Sep. 2017

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I would do it like this:

% define x Axis and evaluate functions

x_points = -5:0.1:5;

function1 = -x+1;

function2 = x+1;

index_intersection = find(function1 == function2);

x_value_intersection = x_points(index_intersection);

y_value_intersection = function1(index_intersection);

% plot functions and intersection point:

curve1 = plot(x_points, function1);

hold on

curve2 = plot(x_points, function2);

intersection = plot(x_value_intersection, y_value_intersection,...

'Marker', '+', 'MarkerSize', 6, 'Color', 'r');

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Cyril Okhio am 13 Nov. 2018

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Sorry it did not work. There are errors in Line 9.

Image Analyst am 5 Jun. 2021

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@Cyril Okhio, I think @Simon Kölbl meant this:

clc;% Clear command window.

fprintf('Running %s.m ...\n', mfilename);

clear;% Delete all variables.

close all;% Close all figure windows except those created by imtool.

workspace;% Make sure the workspace panel is showing.

% Define x Axis and evaluate functions

x_points = -5:0.1:5;

function1 = -x_points+1;

function2 = x_points+1;

index_intersection = find(function1 == function2);

x_value_intersection = x_points(index_intersection)

y_value_intersection = function1(index_intersection)

% Plot functions and intersection point:

curve1 = plot(x_points, function1);

hold on

curve2 = plot(x_points, function2);

intersection = plot(x_value_intersection, y_value_intersection,...

'Marker', '+', 'MarkerSize', 20, 'Color', 'r', 'LineWidth', 2);

grid on

caption = sprintf('At intersection, x = %f, y = %f', x_value_intersection, y_value_intersection);

fontSize = 15;

title(caption, 'FontSize', 15);

xlabel('x', 'FontSize', 15);

ylabel('y', 'FontSize', 15);

fprintf('Done running %s.m\n', mfilename);

How to plot 2 lines and find the coordinates of their intersection? (9)

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Matt J am 5 Jun. 2021

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Bearbeitet: Matt J am 5 Jun. 2021

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Using this File Exchange submission,

https://www.mathworks.com/matlabcentral/fileexchange/93470-intersections-of-multiple-2d-lines-or-line-segments

xy=linexlines2D( [1,1,-3].' , [1,-1,1] ); %the intersection point

hold on

fimplicit(@(x,y) x+y-3);

fimplicit(@(x,y) x-y+1);

plot(xy(1),xy(2),'or','MarkerFaceColor','r')

hold off

How to plot 2 lines and find the coordinates of their intersection? (11)

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Preetham Manjunatha am 8 Feb. 2022

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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. if you need to find the intersection of the multiple line segments, MATLAB's Mapping Toolbox has function polyxpoly - that finds the intersection points for lines or polygon edges.

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Translated by How to plot 2 lines and find the coordinates of their intersection? (13)

How to plot 2 lines and find the coordinates of their intersection? (14)

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