# construct a copula model
M = matrix(c(2, 0, 0, 0, 4, 3, 0, 0, ~X1 + X5, ~X2, ~X3, ~X4 + X6),
ncol = 4, byrow = TRUE)
g.model = hac(HAC_GUMBEL, M)
# return the parameter
get.params(g.model) # [1] 2 4 3
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