Repeated elements in an array

Question

Rim Abdallah 2022-5-4

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1711525-repeated-elements-in-an-array

评论： Rim Abdallah 2022-5-4

采纳的回答： Stephen23

if I have:

A=[3 7 25 27 30 31 32 34 35 36]

B=[2 4 2 2 2 0 3 2 3 2]

How can I have the index of the first element repeated in B and use it in A to have :

A=[3 7 25 31 32 34 35 36]

B=[2 4 2 0 3 2 3 2]

I used diff(B), but it will give:

A=[3 7 30 31 32 34 35 36]

B=[2 4 2 0 3 2 3 2]

(30 instead of 25, 30 represents the last element in B that has value of 2; or what I want is the first element in B that has value of 2 which is 25 in my case).

Is there any logic way or i should use a loop?

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Answer 1

Stephen23 2022-5-4

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1711525-repeated-elements-in-an-array#answer_956935

编辑：Stephen23 2022-5-4

在 MATLAB Online 中打开

A = [3 7 25 27 30 31 32 34 35 36];
B = [2 4 2 2 2 0 3 2 3 2];

Either define new variables:

X = [true,diff(B)~=0];
C = A(X)
C = 1×8
     3     7    25    31    32    34    35    36
D = B(X)
D = 1×8
     2     4     2     0     3     2     3     2

or if you really want to remove elements from A and B:

Y = [false,~diff(B)];
A(Y) = []
A = 1×8
     3     7    25    31    32    34    35    36
B(Y) = []
B = 1×8
     2     4     2     0     3     2     3     2