Find intersectional points of two discrete functions?

Question

Tuoi 2013-8-9

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/84382-find-intersectional-points-of-two-discrete-functions

I have two line graphs (Y=Y(X) and Z=Z(X)) with n discrete points of three arrays: X=[X1 X2 ... Xn], Y=[Y1 Y2 ... Yn] and Z=[Z1 Z2 ... Zn]

I plot two graphs by command: plot(X, Y, X, Z);

Now I want to get all of intersectional points of these two graphs. What command in Matlab can I use to do this? Please help me. Thanks.

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Jan 2013-8-9

The description is not clear yet. Please add an example by editing the question (not by posting a pseudo-answer or by hiding information in a comment):

What is the desired output for X=1:3, Y=[0, 3, 2], Z=[1,2,2]?

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Answer 1

David Sanchez 2013-8-9

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https://ww2.mathworks.cn/matlabcentral/answers/84382-find-intersectional-points-of-two-discrete-functions#answer_93959

在 MATLAB Online 中打开

C = intersect(A,B)

returns the values common to both A and B. The values of C are in sorted order.

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Tuoi 2013-8-9

No, Y and Z can not have similar elements, normally I interpolate them to get intersectional points. My problem is that I find a command of Matlab to do this easily, in Matlab can I find it? Thanks. Not "intersect" command.

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