Efficient method to detect nonzero value trains up to a certain lenght?

Benjamin asked: 2021-01-05 matlab , signal , signal processing

Need help detecting nonzero value trains of a specific length in MATLAB? This resource offers an efficient method and solutions. Learn how to optimize your code

Expert Answer

Kshitij Singh answered . 2025-07-30 05:39:50

  n=3;
  P=find(~[0 x(:).' 0]);
  d=diff(P)-1;
  idx=(d>=1)&(d<=n);
  
  locations=P( idx  );
  lengths=d(idx);
  
  z=zeros(1,numel(x)+1);
  z(locations)=1;
  z(locations+lengths)=-1;
  
  result =cumsum(z(1:end-1)),

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