Cluster Segments
Calculate boundary indexes of clusters of 1’s.
clustersegment(x)
x |
input data, specified as a numeric vector or matrix, coerced to
contain only 0's and 1's, i.e., every nonzero element in |
The function calculates the initial index and end index of sequences of 1's
rising and falling phases of the signal in x. The clusters are sought
in the rows of the array x. The function works by finding the indexes
of jumps between consecutive values in the rows of x.
A list of size nr, where nr is the number
of rows in x. Each element of the list contains a matrix with two
rows. The first row is the initial index of a sequence of 1’s and the
second row is the end index of that sequence.
Juan Pablo Carbajal, carbajal@ifi.uzh.ch.
Conversion to R by Geert van Boxtel, G.J.M.vanBoxtel@gmail.com.
(x <- c(0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 1, 1)) (ranges <- clustersegment(x)) # The first sequence of 1's in x lies in the interval (r <- ranges[1,1]:ranges[2,1]) x <- matrix(as.numeric(runif(30) > 0.4), 3, 10) ranges <- clustersegment(x) x <- c(0, 1.2, 3, -8, 0) ranges <- clustersegment(x)
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