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# Computation of MEWMA steady-state pdf (multivariate mean monitoring)
mewma.psi <- function(l, cE, p, type="cond", hs=0, r=20) {
if ( l<=0 | l>1 ) stop("l has to be between 0 and 1")
if ( cE<=0 ) stop("threshold c has to be positive")
if ( p<1 ) stop("wrong dimension parameter")
if ( hs<0 ) stop("wrong head start value")
if ( r<4 ) stop("resolution too small")
itype <- pmatch(tolower(type), c("cond", "cycl")) - 1
if ( is.na(itype) ) stop("wrong type of steady-state density")
zeug <- .C("mewma_psi", as.double(l), as.double(cE), as.integer(p), as.integer(itype), as.double(hs), as.integer(r),
ans=double(length=3*r+1), PACKAGE="spc")$ans
zahl <- zeug[1]
PSI <- zeug[1:r + 1]
w <- zeug[1:r + r+1]
z <- zeug[1:r + 2*r+1]
l2 <- ( (1-l)/l )^2
fchi <- function(u, a) 2*a * dchisq( u^2/l^2, p, ncp=l2*a^2)/l^2
if ( itype == 0 ) psi <- Vectorize(function(x) sum( w * PSI * fchi(sqrt(x), z))/zahl, "x")
if ( itype == 1 ) {
if ( hs < 1e-9 ) psi <- Vectorize(function(x) dchisq( x/l^2, p)/l^2 / zahl + sum( w * PSI * fchi(sqrt(x), z) ), "x")
if ( hs >= 1e-9 ) psi <- Vectorize(function(x) fchi(sqrt(x), hs) / zahl + sum( w * PSI * fchi(sqrt(x), z) ), "x")
}
psi
}
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