Nothing

```
pgfyule <-
function(s,params) {
require(hypergeo)
k<-s[abs(s)>1]
if (length(k)>0)
warning("At least one element of the vector s are out of interval [-1,1]")
if (length(params)>1) stop("The length of params is 1")
theta<-params[1]
if (theta<=0)
stop ("Parameter theta must be positive")
theta/(theta+1)*Re(hypergeo(1,1,theta+2,s))
}
```

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