# How to remove repeating entries from a vector?

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L'O.G. on 17 Apr 2023
Commented: Image Analyst on 17 Apr 2023
How do you remove repeating entries in a vector?
For example: A = [1 1 1 0 0 1 1 1 1 0 0 0 0 0] should return B = [ 1 0 1 0].
The unique function does not do this from what I can tell. For the above example, it would return [0 1], which is not what I want.
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Image Analyst on 17 Apr 2023
Are the values always 1s and 0s? Or could you have something like [9,9,9,4,4,6,6,6,1,1,0,2,2]? If the latter would the result be [9,4,6,1,0,2]? What's the use case? Why do you need it? Is it your homework?

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### Answers (1)

Matt J on 17 Apr 2023
Edited: Matt J on 17 Apr 2023
You can use this FEX download,
A = [1 1 1 0 0 1 1 1 1 0 0 0 0 0];
starts=groupLims(A);
B = A(starts)
B =
1 0 1 0
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