Generate from logistic \(Y \sim {P_x}\), where \(P_{x}\) is probability of extremal function scaled by a Frechet variate
.rPlog(d, index, theta)
a d
-vector from \(P_x\)
dimension of the 1-sample
index of the location. An integer in 0, ..., \(d-1\)
a one-dimensional parameter for the logistic model, strictly greater than 1.