interpolateNA: Interpolate NAs

In soundgen: Sound Synthesis and Acoustic Analysis

Interpolate NAs

Description

Takes a numeric vector, such as a pitch contour, and fills in the NAs, first by linear interpolation in the middle and then by constant or linear interpolation at the ends.

Usage

interpolateNA(x, idx_na = NULL, nPoints = 1)

Arguments

x	numeric vector
idx_na	which(is.na(x))
nPoints	the number of points to use for interpolating leading and trailing NAs: 1 = constant interpolation, 2 = use the first two non-NAs at the beginning and the last two non-NAs at the end (possibly after interpolating NAs in the middle), etc.

Value

The input numeric vector with NAs filled in by interpolation.

Examples

a = c(NA, 405, NA, 460, NA, NA, NA, 480, 490, NA, NA)
interpolateNA(a)
interpolateNA(a, nPoints = 3)
plot(interpolateNA(a), type = 'l', col = 'blue'); points(a)
plot(interpolateNA(a, nPoints = 3), type = 'l', col = 'blue'); points(a)
# Compare to approx - terminal NAs are simply trimmed
approx(a, na.rm = TRUE, n = length(a))$y

soundgen documentation built on Sept. 20, 2026, 5:07 p.m.