params<-.3
pgfIyule(.9,params)
## The function is currently defined as
pgfIyule <- function(s,params) {
xval<-length(s)
for (i in 1:length(s)) {
func<-function(x) pgfyule(x,params)-s[i]
xval[i]<-uniroot(func,lower=0,upper=1)$root
}
xval
}
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