Detect sequence of numbers in array

Question

1 个投票

I want to be able to detect when a sequence of numbers starts and finishes in an array. For example, if I have

A = [1 0 1 0 1 0 1 1 0 0 1 1 0 0 1 1 0 0 1 0 1 0 1 0]; 
B = [1 1 0 0];

Can I determine whether A contains B and if A does contain B, get the index of A that B starts and stops (so 7 and 18 here)

Thank you

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Answer 1

the cyclist 2017-3-17

编辑：the cyclist 2017-3-17

7 个投票

Even though these are not strings, you can use strfind as the key component to doing what you want

strfind(A,B)

will find the starting indices where B is embedded in A.

It is not perfectly clear to me how you want to handle repetitions, or repetitions with gaps, etc. So, maybe this is enough to get you started?

Answer 2

Jan 2017-3-17

3 个投票

The sequence is found at the positions 7, 11 and 15. If you search for "7, 18", I guees you want:

Index  = strfind(A, B);
Result = [Index(1), Index(end) + length(b) - 1];

A fallback is required, when no match is found.