clustersegment function

Cluster Segments

Calculate boundary indexes of clusters of 1’s.

clustersegment(x)

Arguments

• 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 x will be replaced by 1.

Returns

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.

Details

The function calculates the initial index and end index of sequences of 1s 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.

Examples

(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)

Author(s)

Juan Pablo Carbajal, carbajal@ifi.uzh.ch .

Conversion to R by Geert van Boxtel, G.J.M.vanBoxtel@gmail.com .