How to use spline interpolation to find intersection point of two lines.

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PetronasAMG
PetronasAMG 2021-11-9
评论： PetronasAMG 2021-11-9
Ran in:
Hi, Just new to matlab and still trying to understand spline interpolation. Although we can eye ball the interspection point, how do you use spline interpolation to find the exact interspection point? please help!
x = [-10 2];
y1 = -x
y1 = 1×2
10 -2
y2 = x+6;
plot(x,y1), hold on;
plot(x,y2);

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采纳的回答

H R
H R 2021-11-9
How about this?
clc
clear all
x = -10:1:1;
y1=-x;
y2=x+6;
%spline1
s1 = spline(x,y1);
%spline 2
s2=spline(x,y2);
% find zeros
x0 = fzero(@(x) (ppval(s1,x)-ppval(s2,x)), 0)

更多回答（1 个）

Matt J
Matt J 2021-11-9
编辑：Matt J 2021-11-9
Ran in:
If they are straight lines, I'm not sure why you would want to use splines.
x = [-10 2];
y1 = -x;
y2 = x+6;
P=[x,x;y1 y2; 1 1 1 1 ];
p=cross( cross(P(:,1),P(:,2)) , cross(P(:,3),P(:,4)) );
p=p(1:2).'/p(3) %intersection point
p = 1×2
-3 3

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