Determining the intersection of two vectors

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Jack
Jack 2014-12-19
回答： Mouna SAMAALI 2021-5-12
Below is my working code for a simple program to graph two vectors.
line([0,50],[30,30]); line1 = [0 30 50 30 ];
line([55,55],[15,30]); line2 = [55 15 55 30];
C = intersect(line1,line2)
Below is the visual representation of these two lines:
It is barely visible in the top right corner that these two lines do not intersect. intersect(A,B) however indicates they're intersecting at 30. I assume this is because it treats the vectors as lines which extend forever? Is there any functionality for matlab which would handle only the given space as opposed to infinite length? It should ideally return these lines do not intersect.
Thanks!

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采纳的回答

Star Strider
Star Strider 2014-12-19
The intersect function is a set operation in MATLAB. It looks for the points (elements) that ‘line1’ and ‘line2’ have in common. They both have 30 so that is the correct result.
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更多回答（3 个）

Azzi Abdelmalek
Azzi Abdelmalek 2014-12-19
line1 and line2 are two arrays,
C = intersect(line1,line2)
will return the common elements to the two arrays
Jack
Jack 2014-12-19
Ah, ok thanks. Is there a different function for (x,y) intersection point which returns NaN if they don't intersect? That's really what I'm looking to find.
Mouna SAMAALI
Mouna SAMAALI 2021-5-12
I have a question about how can I convert this Line of code matlab to Simulink . I would like to use only blocks Simulink ?
A=union(A,setxor(B,intersect(B,C)));where A, B et C are vectors
So I ask about blocks Simulink that make the intersection, the union and setxor of two vectors.
Thanks in advance for your help .

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