Megh Dal wrote: > Hi, > > I want to find solution of function : f(x,y) = x'Cx - a under constraints : > > 0 < x,y < p > 0 < x-y< q > > where a, p,q are given constants and x = (x, y) and C is a 2X2 matrix > (given) > > Can anyone suggest me any R function to do that? > > Not likely. What you have (if C is positive definite) is the intersection between the boundary of an ellipse and the interior of a parallelepiped, where the center of the ellipse and one corner of the parallelepiped is at (0,0).
This is the union of between zero and three curve segments (hmm, maybe only two) and I don't think any of the standard solvers and minimizers can come up with that kind of result. -- O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 ______________________________________________ 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.
