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How to find out zeros and their indices in a matrix?

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SM
SM 2020년 7월 21일
댓글: SM 2020년 7월 21일
I have an input matrix of size 3*13 double:
input=[0 0 1 0 0 0 1 1 1 0 0 0 0;
0 1 0 0 1 1 0 0 0 1 0 1 0;
0 1 1 1 1 0 0 0 1 0 0 1 0];
I want to know how many zeros subsequently have in
input(2,:)
The output should be:
output=[1 2 3 1 1];
I also want to know their starting index of zeros. It should look like:
index=[1 3 7 11 13];
How can i solve this problem?

채택된 답변

Bruno Luong
Bruno Luong 2020년 7월 21일
편집: Bruno Luong 2020년 7월 21일
v=input(2,:)>0; % remove >0 if your matrix contains only 0 or 1
d = diff([1, v, 1]);
index = find(d==-1)
output = find(d==1)-index

추가 답변(1개)

Matt J
Matt J 2020년 7월 21일
편집: Matt J 2020년 7월 21일
One way is to use this FEX submission,
H=group1s(~input(2,:));
output=histcounts(H); output(1)=[];
[~,index]=unique(H); index(1)=[];

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