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identifing the beginning and the end of a series

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Hi,
I have long vectors that have the following structures of zeros and ones: 1 1 1 1 1 1 1 0 0 0 0 0 0 1 1 1 1 1 1 1 0 0 0 1 1 1 1 1 1 1 0 0 0 0 0 0 1 1 1 1 1 1 1 0 0 How can I identify the 0 that comes before the series of ones? i.e observation 1 and 14. Using the same logic, how can I identify the end of series of ones i.e observations 8 and 21?

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Accepted Answer

Wayne King
Wayne King on 27 Apr 2012
I = find(diff(x)==1);
J = find(diff(x)== -1);
I is 1 and 14, J is 8 and 21

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