Nothing

```
pgfwaring <-
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)<2) stop("At least one value in params is missing")
if (length(params)>2) stop("The length of params is 2")
cc<-params[1]
a<-params[2]
if (cc<=0)
stop ("Parameter c must be positive")
if (a<=0)
stop ("Parameter a must be positive")
(cc-a)/cc*Re(hypergeo(1,a,cc+1,s))
}
```

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