## Adapted from
# https://stackoverflow.com/questions/2776135/last-observation-carried-forward-in-a-data-frame/41752185#41752185
replace_NAs_with_next_or_previous_non_NA <- function(x, direction = c("previous", "next"), remove_na = FALSE) {
if (direction == "next") {
x <- rev(x)
}
v <- !is.na(x)
x <- c(NA, x[v])[cumsum(v) + 1]
if (direction == "next") {
x <- rev(x)
}
if (remove_na == TRUE) {
x <- x[!is.na(x)]
}
return(x)
}
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