Nothing
irf <-
function(ip, x, D = 1.7){
ni = nrow(ip)
f = sapply(1:ni, function(i) {ip[i, 3] + (1 - ip[i, 3])/(1 + exp(-D*ip[i, 1] * (x-ip[i, 2])))})
r = list(x = x, f = f)
return(r)
}
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