Split signal if there are zero values

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Manolis Michailidis
Manolis Michailidis on 7 Jan 2016
Answered: goerk on 8 Jan 2016
Hello, my task is simple i want to divide my signal into number x parts, where x is when the difference between the last nonzero value and the next to be found should be greater than a threshold, T. I tried to implement this but i always get the new result to be the same, my vector is not divided into subvectors.
s1=[0,1,2,5,0,0,5,3,0,0,0,0,3,4,1,2];
h=0;
T=4;
for kk=1:length(s1)-1
if diff([s1(kk) s1(kk+1)])<T
h=h+1;
P{h}=[s1(kk):s1(kk+1)];
end
end
Any suggestion wellcomed, or shoould i use combine the find with the unique functions? thank you.
  5 Comments
Walter Roberson
Walter Roberson on 8 Jan 2016
hemalatha, notice that the break is taken at the point where there are T zeros in a row. I suspect that is what the poster is asking about, difference in position rather than difference in value itself.

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Accepted Answer

goerk
goerk on 8 Jan 2016
s1=[0,1,2,5,0,0,5,3,0,0,0,0,3,4,1,2];
signalID = cumsum([0 diff(s1)>4]);
nofSignals = signalID(end)+1;
for i=1:nofSignals
P{i}=s1(signalID==i-1);
end

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