how to find intersection point or value between two array????

Question

suchismita 2015-8-27

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https://ww2.mathworks.cn/matlabcentral/answers/237079-how-to-find-intersection-point-or-value-between-two-array

回答： Steven Lord 2015-8-27

I have two array as A and B, where,

A=[1.2222 1.2233 1.3344 1.3354 1.4354]
B=[1.1123 1.2234 1.3254 1.4892 1.5678]

I want 2nd element of A and B to intersect but as A's value is not exact equal to B i am not able to plot my graph. as, A's 2nd value is 1.2233 and B's 2nd value is 1.2234 which is almost equal so i want to put a condition as to search equality till 3rd value after decimal.

please please help me

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Answer 1

Matt J 2015-8-27

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https://ww2.mathworks.cn/matlabcentral/answers/237079-how-to-find-intersection-point-or-value-between-two-array#answer_190539

编辑：Matt J 2015-8-27

在 MATLAB Online 中打开

 AA=floor(A*1000);
 BB=floor(B*1000);
 find(AA==BB),

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Answer 2

Steven Lord 2015-8-27

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Take a look at the ISMEMBERTOL and UNIQUETOL functions.

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Answer 3

Star Strider 2015-8-27

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https://ww2.mathworks.cn/matlabcentral/answers/237079-how-to-find-intersection-point-or-value-between-two-array#answer_190540

在 MATLAB Online 中打开

One possibility:

roundn = @(x,n) 10.^-n.*round(x.*10.^n);
A=[1.2222 1.2233 1.3344 1.3354 1.4354];
B=[1.1123 1.2234 1.3254 1.4892 1.5678];
ABI = intersect(roundn(A,3), roundn(B,3))
ABI =
       1.2230