i need to find the value (on x-axis ) of the first intersection point between two line by matlab
See attached for (data ,code and output )
You can use the following function to extract all intersection points between two lines:
https://www.mathworks.com/matlabcentral/fileexchange/22441-curve-intersections
From there, just get the first intersection point (the one with the minimum x value) from the output of the function.
Dear Ricardo
Thank you for this answer
but the function to extract all intersection points between two lines which called " InterX" not working on Matlab R2014a where this message appears:
Undefined function 'InterX' for input arguments of type 'double'.
Regards
Abdel Rahim
You can find the intersection point by using the curve fitting tool from MATLAB and selecting the interpolant fit. I’m sending you two pictures to illustrate the process.
A lineal fit of the two points closest to zero will result in the equation: -155,3*x+33,74=y. This formula provides x = 0,21725692208 for y = 0.
Good Luck!
Abdel, you have to download the function in the link I posted before. It is a 3rd party function.
After downloading, put the InterX.m file in the directory that you are working.
Dear Ricardo
Thanks for clarification
I found another solution where:the function "polyxpoly" used for Intersection points for lines or polygon edges
http://www.mathworks.com/help/map/ref/polyxpoly.html
Many Thank
Regards
Abdel Rahim
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