To find intersection point of two lines?

9 views (last 30 days)
x1=7.8;
x2=8.5;
y1=0.96;
y2=0.94;
p1 = polyfit([x1 x2], [y1 y2], 2);
b1= polyval(p1,1);
m1=polyval(p1,2)-b1;
x3=8.25;
x4=8.25;
y3=0;
y4=.99;
p2 = polyfit([x3 x4], [y3 y4], 2);
b2 = polyval(p2, 1);
m2 = polyval(p2, 2) - b2;
I got x value = -1.2867; from which co-ordinate this value corresponds to? Actually I want to compute intersection of two line with respect to x=[7.8 8.25 8.5]; y=[0.96 0.99 0.94]; over which those two lines are plotted?
x=[7.8 8.25 8.5];
y=[0.96 0.99 0.94];
p=polyfit(x,y,2);
f=polyval(p,x);
plot(x,y,'o',x,f,'-');
hold on;
line([7.8 8.5],[0.96 0.94]);
hold on;
line([8.25 8.25],[0 0.99]);
  2 Comments
Image Analyst
Image Analyst on 7 Apr 2013
Edited: Image Analyst on 7 Apr 2013
Do you want to do it numerically (using quantized arrays), or analytically (using algebraic equations)? Why did you tag this as digital image processing?

Sign in to comment.

Accepted Answer

Jing
Jing on 27 Apr 2013
'polyxpoly' can get intersect points for lines. Is this what you want?

More Answers (0)

Categories

Find more on Vehicle Scenarios in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!