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find seqence of values in an array

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Allan
Allan 2016-3-1
关闭： MATLAB Answer Bot 2021-8-20
I have an array of 1000-2000. Within that are some sequences of 4-5 elements. How can I find then?
  2 个评论
Jan
Jan 2016-3-1
编辑：Jan 2016-3-1
Do you mean, that the array is a vector with 1000 to 2000 elements? And some neighboring 4 to 5 elements are equal? Or are you searching for a specific sequence of 4 to 5 elements?
Please edit the question and insert a small example with inputs and wanted outputs.
the cyclist
the cyclist 2016-3-1
So, a small version would be that you have an array A like
A = [1 1 1 1 2 3 4 78 12 16 17 18 19 20 20 20 43]
and you want to find the sequences
1 2 3 4
and
16 17 18 19 20
?
What specifically do you want the output to be?

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回答（1 个）

Florian Bendl
Florian Bendl 2016-3-1
Judging by your example: - Generate a difference vector B = diff(A); - Generate a logical from it B = B == 1; - Loop through the vector and note down when B switches from 0 to 1 and from 1 to 0 respectively. This will give you the beginning and the end of the sequences.- - Having the positions, you can easily choose the longest one.

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