find seqence of values in an array

I have an array of 1000-2000. Within that are some sequences of 4-5 elements. How can I find then?

[Jan]

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]

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?

Answer 1

[Florian Bendl]

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.