To be honest, The first derivative of my objective function is very complicated so I ignore this. Could it lead to this sort of problem?
Kathie -- View this message in context: http://r.789695.n4.nabble.com/optimization-problems-tp3741005p3741010.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.