Previous versions have this question have partially bounced. I apologize if parts of this are showing up multiple times on the list. Another try ... There was at one time an R package called Rdonlp2 for solving constrained nonlinear programming problems. Both the objective function and the constraints could be nonlinear in the decision variables. The package is no longer in the CRAN list. Does anyone know what happened to it? At one point a zip file of the package was available at arumat.net/Rdonlp2/, but now that is missing also. I sent an email to the author but received no response. Are there any alternatives for constrained nonlinear programming problems among the active packages? I need something that will solve the same kinds of problems that, say, Excel Solver will do using the grg2 algorithm (or something similar). Thanks Richard Valliant
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