Nothing
"pdfgum" <-
function(x,para) {
if(! are.pargum.valid(para)) return()
U <- para$para[1]
A <- para$para[2]
Y <- -(x - U)/A
f <- A^(-1)*exp(Y)*exp(-exp(Y))
names(f) <- NULL
f[! is.finite(f)] <- NA
f[is.na(f)] <- 0 # decision Dec. 2015
return(f)
}
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