I would like to know how to count sequences of 1 within a vector containing only 0 and 1. For example, in the x <- c(1, 1, 0, 0, 1, 0, 1, 1) vector, the count would give the (2, 1, 2) vector, which counts the sequence of 2 "1", 1 "1", and finally 2 "1".
Count sequences of 1 within vector in R
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asked by anonymous 12.11.2017 / 01:24
1 answer
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The rle function is perfect for this. It counts exactly the number of sequence lengths and values in a vector:
x <- c(1, 1, 0, 0, 1, 0, 1, 1)
contagem <- rle(x)
contagem$lengths[contagem$values==1]
[1] 2 1 2
Even though this was not asked for in the original question, this function could have been used to count the sequences sizes of "0":
contagem$lengths[contagem$values==0]
[1] 2 1
For more information, use the ?rle command.
12.11.2017 / 01:59