Find at least 5 consecutive values above a certain threshold in a vector?
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I have a vector
M = [3,3,5,7,8,8,9,7,4,3,2,1,7,6,5,2,2,2];
I want to find at least 5 consecutive values which are above the threshold, which is 4. So the vector will be
N = [5,7,8,8,9,7]
Could anyone help me with this? Thanks.
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채택된 답변
Walter Roberson
2019년 4월 17일
mask = M > 4;
starts = strfind([0 mask], [0 1 1 1 1 1]);
stops = strfind([mask 0], [1 1 1 1 1 0]);
N = M(starts(1) : stops(1))
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추가 답변 (2개)
Akira Agata
2019년 4월 17일
If there are 2 or more consective values above the threshold, the following is one possible solution.
(* The following needs Image Processing Toolbox)
M = [3,3,5,7,8,8,9,7,4,3,6,5,8,5,8,2,1,7,6,2,6,2];
idx = M > 4;
idx = bwareafilt(idx,[5,Inf]);
label = bwlabel(idx);
N = cell(max(label),1);
for kk = 1:max(label)
N{kk} = M(label == kk);
end
Result:
>> N
N =
2×1 cell array
{1×6 double}
{1×5 double}
>> N{1}
ans =
5 7 8 8 9 7
>> N{2}
ans =
6 5 8 5 8
>>
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Akira Agata
2021년 4월 9일
OK. I believe the error was due to the difference between the 3D matrix in my sample code and the real data.
Is it possible to upload part of your real data and the modified code which generates the error?
Ahmad Bayhaqi
2021년 5월 1일
Hi @Akira Agata
Thank you for your code. It works for me.
However, since my temperature data contains date. How the result of looping includes the datetime to define when the temperature is higher than threshold?
Thank you very much
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