Find zero-crossings and inversion points

Find zero crossings of a vector, i.e., indices when the numeric variable crosses 0. It is useful for finding the points where a function changes by looking at the zero crossings of its derivative.

Usage

zero_crossings(x)

find_inversions(x)

Arguments

x

A numeric vector.

Value

Vector of zero crossings or points of inversion.

See also

Based on the uniroot.all function from the rootSolve package.

Examples

x <- sin(seq(0, 4 * pi, length.out = 100))
plot(x, type = "b")


zero_crossings(x)
#> [1]  1.00000 25.74975 50.50000 75.25025
find_inversions(x)
#> [1] 12.87478 37.62484 62.37516 87.12522