Find the longest sequence of consecutive non-zero values in a vector
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Hello everyone, I want to know how to find in a vector the longest sequence of consecutive non-zero values. example: I have x = [0 1 2 3 0 5 6 7 8 0 10]; I must have as output the block y = [5 6 7 8] Thank you in advance.
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Walter Roberson
2018년 6월 7일
x = [0 1 2 3 0 5 6 7 8 0 10];
zpos = find(~[0 x 0]);
[~, grpidx] = max(diff(zpos));
y = x(zpos(grpidx):zpos(grpidx+1)-2);
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Walter Roberson
2018년 6월 7일
Note: the 0 before and after x in [0 x 0] are there in case the input, x, does not begin with a 0, or does not end with a 0. There are implied markers of beginning of sequence at the beginning of x and of end of sequence at the end of x.
추가 답변 (1개)
Adam
2018년 6월 7일
or other similar run length functions should help, especially if you trivially binarise your input first.
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Jan
2018년 6월 7일
x = [0 1 2 3 0 5 6 7 8 0 10];
[b, n, xIdx] = RunLength(x ~= 0);
xIdx = xIdx(b);
[maxN, nIdx] = max(n(b));
r = x(xIdx(nIdx):xIdx(nIdx) + maxN - 1)
I think, Walter's solution is nicer.
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