Finding consecutive zeros in an array. Not able to solve using diff command

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Jaya
Jaya 2021-10-24
评论： Andreia Gomes 2022-9-15
I have an array like below
a=[0 0 1 1 -1 0 0 0 1 1 1 -1 0 0 1 -1] %in my actual code, there are many elements
There is a -1 after every set of 1s like an end marker. I want to find the largest number of consecutive zeros present. Here it would be 3.
I used diff(a) but in this case even 1-1=0 along with 0-0=0. I also tried manipulating the array with some math operations and then using diff(a) but no use.
Any idea on how to do this?

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采纳的回答

Stephen23
Stephen23 2021-10-24
Ran in:
a = [0,0,1,1,-1,0,0,0,1,1,1,-1,0,0,1,-1];
d = diff([false,a==0,false]);
b = find(d>0);
e = find(d<0);
m = max(e-b)
m = 3

更多回答（1 个）

Matt J
Matt J 2021-10-24
编辑：Matt J 2021-10-24
Using,
https://www.mathworks.com/matlabcentral/fileexchange/78008-tools-for-processing-consecutive-repetitions-in-vectors
[~,~,runLengths]=groupLims(groupTrue(~a),1);
maxLength=max(runLengths)

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