Are you looking for a unique solution or families of solutions? Can't you turn a root-finding problem for a system of equations with a unique solution into an optimisation problem, anyway?
E.g. You want to solve f1(x) = g1 f2(x) = g2 ... Why not optimise L(x) = (f1(x) - g1)^2 + (f2(x) - g2)^2 + ... with respect to x? If the minimum value is zero, then you are done; if it is greater than zero your original system does not have a solution. If you are in the complex domain the changes needed are obvious. V. : -----Original Message----- : From: [EMAIL PROTECTED] : [mailto:[EMAIL PROTECTED] On Behalf Of John Janmaat : Sent: Monday, 2 May 2005 12:48 AM : To: [email protected] : Subject: [R] Roots of quadratic system. : : : Hello, : : I have a system of quadratic equations (results of a : Hamiltonian optimization) : which I need to find the roots for. Is there a package : and/or function which : will find the roots for a quadratic system? Note that I am : not opimizing, but : rather solving the first order conditions which come from a : Hamiltonian. I am : basically looking for something in R that will do the same : thing as fsolve in : Matlab. : : Thanks, : : John. : : ============================================== : Dr. John Janmaat : Department of Economics : Acadia University : Tel: 902-585-1461 : : ______________________________________________ : [email protected] mailing list : https://stat.ethz.ch/mailman/listinfo/r-help : PLEASE do read the posting guide! : http://www.R-project.org/posting-guide.html : ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
