Convert changepoint sets to binary strings

Convert changepoint sets to binary strings

Usage

binary2tau(x)

tau2binary(tau, n)

Arguments

x

A binary string that encodes a changepoint set. See GA::gabin_Population().

tau

a numeric vector of changepoint indices

n

the length of the original time series

Value

• binary2tau(): an integer vector

• tau2binary(): an integer vector of length n

Details

In order to use GA::ga() in a genetic algorithm, we need to encoude a changepoint set as a binary string.

binary2tau() takes a binary string representation of a changepoint set and converts it into a set of changepoint indices.

tau2binary() takes a set of changepoint indices the number of observations in the time series and converts them into a binary string representation of that changepoint set.

Examples

# Recover changepoint set indices from binary strings
binary2tau(c(0, 0, 1, 0, 1))
#> [1] 3 5
binary2tau(round(runif(10)))
#> [1]  2  4  5  7  8 10

# Recover binary strings from changepoint set indices
tau2binary(c(7, 17), n = 24)
#>  [1] 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0
tau2binary(binary2tau(c(0, 0, 1, 1, 0, 1)), n = 6)
#> [1] 0 0 1 1 0 1