"cdfray" <-
function(x,para) {
if(! are.parray.valid(para)) return()
U <- para$para[1]
A <- para$para[2]
Y <- x - U
f <- (1 - exp(-1*(Y)^2/(2*A^2)))
names(f) <- NULL
f[Y <= 0] <- 0
return(f)
}
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