runs of 1s and 2s in a long vector
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Pappu Murthy
el 26 de Jul. de 2018
Comentada: Pappu Murthy
el 26 de Jul. de 2018
i have a long vector which has a whole bunch of 1s and 2s.. I need to find how many such strings of 1s and 2s are there. Is there a slick way of getting this out of the array?
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Sushant Mahajan
el 26 de Jul. de 2018
Do you need the total number of 1s and 2s? Or are you looking for the number of consecutive bunches (groups) of 1s/2s in that array?
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Guillaume
el 26 de Jul. de 2018
Editada: Guillaume
el 26 de Jul. de 2018
If you want to find the number of runs (regardless of their length) as opposed to the count of 1s or 2s:
v = [0 3 1 1 1 4 5 6 2 2 2 1 1 2 7 8 9 1 1 1 2 2 1 1 1 10 11 2 2 12 2]; %demo data
runcount = @(v, n) nnz(diff([false, v == n]) == 1); %works only for row vectors
runsof1 = runcount(v, 1)
runsof2 = runcount(v, 2)
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Stephen23
el 26 de Jul. de 2018
@Pappu Murthy: try starting the vector with one of the values that you are matching, and you will see why false is required.
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