I want to know the starting index of consecutive negative elements and also thier count.

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DARSHAN N KANNUR 2021-3-29

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https://ww2.mathworks.cn/matlabcentral/answers/786601-i-want-to-know-the-starting-index-of-consecutive-negative-elements-and-also-thier-count

编辑： Matt J 2021-3-29

I just have an array of 76140 data. What to do, if I want to know the starting index of consecutive negative elements and also thier count. Thank you in advance

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Rik 2021-3-29

Good for you. Do you also have a question? Have you tried anything?

The RunLength FEX submission may be helpful.

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Answer 1

Matt J 2021-3-29

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https://ww2.mathworks.cn/matlabcentral/answers/786601-i-want-to-know-the-starting-index-of-consecutive-negative-elements-and-also-thier-count#answer_661296

编辑：Matt J 2021-3-29

在 MATLAB Online 中打开

Using this File Exchange submission,

https://www.mathworks.com/matlabcentral/fileexchange/78008-tools-for-processing-consecutive-element-groups-in-vectors

yourVector = [0 -3 -4 1 2 7 -9 -10 -11]; %example
G=groupTrue(yourVector<0);
startingIndex  = groupFcn(@(x) x(1)    , 1:numel(G), G),
startingIndex = 1×2
     2     7
count = groupFcn(@numel , G, G),
count = 1×2
     2     3