e_linear_interpolation: Linear interpolation and extrapolation of y conditional on...

In erikerhardt/erikmisc: Erik Erhardt's miscellaneous functions for solving complex data analysis workflows

Linear interpolation and extrapolation of y conditional on spacing of x

Description

If all y are NA, then return y. If all non-NA y values are equal, then impute all y values equal. Otherwise, find at least two non-NA missing values to impute internal, starting, or ending NAs, in that order.

Usage

e_linear_interpolation(
  y,
  x = NULL,
  sw_which = c("all", "internal", "head", "tail")[1],
  sw_extrapolation = c("martingale", "linear")[1]
)

Arguments

y	response values to impute via linear interpolation
x	spacing between y values
sw_which	switch to indicate which missing values to replace: "all", "internal", "head" (starting), or "tail" (ending)
sw_extrapolation	switch to indicate how to extrapolate to head and tail missing values. "martingale" sets NAs to closest non-NA value, while "linear" performs a linear extrapolation from the two closest non-NA values.

Value

y Completed list of numbers

Examples

e_linear_interpolation(y = c(NA, NA, NA, NA, NA))
e_linear_interpolation(y = c(NA, NA, NA, 4, NA))
e_linear_interpolation(y = c(1, NA, 3, NA, 5))
e_linear_interpolation(y = c(1, NA, NA, NA, 5), x = c(1, 2, 4, 8, 16))
e_linear_interpolation(y = c(NA, NA, NA, 4, 5), x = c(1, 2, 4, 8, 16), sw_extrapolation = "linear")
e_linear_interpolation(y = c(NA, NA, 3, 4, NA), x = c(1, 2, 4, 8, 16), sw_which = "head")
e_linear_interpolation(y = c(NA, "a", NA, 3, 4, NA)) # warning for not numeric

erikerhardt/erikmisc documentation built on April 17, 2025, 10:48 a.m.