Hi Rainer,
It is very simple to specify the constraints (linear or nonlinear) in "alabama"
. They are specified in a function called `hin', where the constraints are
written such that they are positive. Your two nonlinear constraints would be
written as follows:
hin <- function(x, LAI) {
h <- rep(NA, 2)
h[1] <- LAI^x[2] / x[3] + x[1]
h[2] <- 1 - x[1] - LAI^x[2] / x[3]
h
}
Please take a look at the help page. If it is still not clear, you can contact
me offline.
Best,
Ravi
Ravi Varadhan, Ph.D. (Biostatistics), Ph.D. (Environmental Engg)
Associate Professor, Department of Oncology
Division of Biostatistics & Bionformatics
Sidney Kimmel Comprehensive Cancer Center
Johns Hopkins University
550 N. Broadway, Suite 1111-E
Baltimore, MD 21205
410-502-2619
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