Nothing
# Computation of EWMA survival function (mean monitoring)
xtewma.sf <- function(l, c, df, mu, n, zr=0, hs=0, sided="two", limits="fix", mode="tan", q=1, r=40) {
if ( l<=0 || l>1 ) warning("l is typically between 0 and 1 -- you should really know what you do")
if ( c <= 0 ) warning("usually, c has to be positive")
if ( df < 1 ) stop("df must be greater or equal to 1")
if ( n < 1 ) stop("n has to be a natural number")
if ( zr > c & sided == "one") stop("wrong reflexion border")
if ( (sided == "two" & abs(hs) > c) | (sided == "one" & ( hs < zr | hs > c )) )
warning("unusual headstart")
ctyp <- pmatch(sided, c("one", "two")) - 1
if ( is.na(ctyp) ) stop("invalid ewma type")
ltyp <- -1 + pmatch(limits, c("fix", "vacl"))
if (is.na(ltyp)) stop("invalid limits type")
ntyp <- -1 + pmatch(mode, c("identity", "sin", "sinh", "tan"))
if ( is.na(ntyp) ) stop("substitution type not provided (yet)")
if ( r < 4 ) stop("r is too small")
q <- round(q)
if ( q<1 ) stop("wrong change point position (q)")
sf <- .C("xtewma_sf",
as.integer(ctyp), as.double(l), as.double(c), as.double(zr), as.double(hs), as.integer(df), as.double(mu),
as.integer(ltyp), as.integer(r), as.integer(ntyp), as.integer(q), as.integer(n),
ans=double(length=n),PACKAGE="spc")$ans
names(sf) <- NULL
sf
}
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