Nothing
arl<-function(h=2,k=2,lambda=1,shift=.5) {
if((h %%2)!=0){
stop("h should be an even integer")
}
k<-floor(k)
# Initialize transition matrix
P<-matrix(0,h+1,h+1)
# index m for row number(1st state), index n for column number (2nd state)
for (m in 1:h) {
for (n in 0:h+1) {
if (n == 1) { P[m,n]<-ppois(k-(m-1),lambda+shift*sqrt(lambda)) }
else { P[m,n]<-dpois(k-m+n,lambda+shift*sqrt(lambda))}
if (n==h+1) {P[m,n]<-1-ppois(k+n-(m+1) ,lambda+shift*sqrt(lambda))}
}
}
P[h+1,h+1]<-1
Q<-P[1:h,1:h]
IQ<-diag(h)-Q
N<-solve(IQ)
c<-rep(1,h)
t<-N%*%c
t
ARL<-round(t[1], digits=2)
ARLFIR<-round(t[floor(h/2)+1], digits=2)
r1<-list("ARL=",ARL)
r2<-list(" ARL(FIR)=",ARLFIR," Valid if h is a even integer ")
result<-c(r1,r2)
return(result)
}
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