Nothing
`pgpd` <-
function(x, m = 0, lambda = 1, xi = 0)
{
k <- xi
if (!SHAPE.XI) k <- -xi
if ((length(m)!=length(lambda))|(length(m)!=length(xi))|(length(xi)!=length(lambda)))
stop("m, lambda and xi should have the same lengths")
n <- length(m)
if ((n > 1) & (length(x) != n))
stop("When vectors of lengths > 1, m, lambda and xi should have the same length as x")
val <- rep(Inf, length(x))
if (n==1)
{
if (k==0) {
val <- 1. - exp(-(x - m)/lambda)
val[x<m] <- 0
}
else
{
val <- 1. + k * (x - m)/lambda
if (k>0) {
val[x<=m] <- 0
val[x>m] <- 1 - val[x>m]^(-1/k)
}
else {
val[x<=m | x >= m-lambda/k] <- 0
val[x>m & x < m-lambda/k] <- 1 - val[x>m & x < m-lambda/k]^(-1/k)
}
}
}
else
{
K0 <- (k==0)
KPOS <- (k>0)
KNEG <- (k<0)
val[K0] <- 1. - exp(-(x[K0] - m[K0])/lambda[K0])
val[(x < m) & K0] <- 0
val[!K0] <- 1. + k[!K0] * (x[!K0] - m[!K0])/lambda[!K0]
val[KPOS & (x<=m)] <- 0
val[KPOS & (x>m)] <- 1 - val[KPOS & (x>m)]^(-1/k[KPOS & (x>m)])
val[KNEG &(x<=m | x >= m-lambda/k)] <- 0
val[KNEG & x>m & x < m-lambda/k] <- 1 - val[KNEG & x>m & x < m-lambda/k]^(-1/k[KNEG & x>m & x < m-lambda/k])
}
val
}
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