Nothing
LocalExtend <- function(x, IsKnot, x2, phi2) {
n <- length(x)
K <- (1:n) * IsKnot
K <- K[K > 0]
phi <- 1:n * 0
phi[K] <- phi2
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])
phi[ind] <- (1 - lambda) * phi2[k] + lambda * phi2[k + 1]
}
}
return(matrix(phi, ncol = 1))
}
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