Nothing
LocalCoarsen <- function(x, w, IsKnot) {
n <- length(x)
K <- (1:n) * IsKnot
K <- K[K > 0]
x2 <- x[K]
w2 <- w[K]
for (k in 1:(length(K) - 1)) {
if (K[k + 1] > (K[k] + 1)) {
ind <- (K[k] + 1):(K[k + 1] - 1)
lambda <- (x[ind] - x2[k]) / (x2[k + 1] - x2[k])
w2[k] <- w2[k] + sum(w[ind] * (1 - lambda))
w2[k + 1] <- w2[k + 1] + sum(w[ind] * lambda)
}
}
w2 <- w2 / sum(w2)
return(list(x2 = matrix(x2, ncol = 1), w2 = matrix(w2, ncol = 1)))
}
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