runs of 1s and 2s in a long vector

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Pappu Murthy
Pappu Murthy 2018-7-26
评论： Pappu Murthy 2018-7-26
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
Sushant Mahajan 2018-7-26
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?
jonas
jonas 2018-7-26
Please provide an example including your desired output.

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Guillaume
Guillaume 2018-7-26
编辑：Guillaume 2018-7-26
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
Stephen23 2018-7-26
@Pappu Murthy: try starting the vector with one of the values that you are matching, and you will see why false is required.
Pappu Murthy
Pappu Murthy 2018-7-26
Thanks. I got it why false is needed.

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