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con <- list(trace = 0, fnscale = 1, parscale = rep.int(1, length(par)),
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ndeps = rep.int(1e-3, length(par)),
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maxit = 100, abstol = -Inf, reltol=sqrt(.Machine$double.eps),
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maxit = 100L, abstol = -Inf, reltol=sqrt(.Machine$double.eps),
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alpha = 1.0, beta = 0.5, gamma = 2.0,