You have two options: 1. The `BBsolve' function in the "BB" package to solve this system of 3 equations. 2. Try `nleqslv' function in the "nleqslv" package.
These would work even if the residual is not zero. Hope this helps, Ravi. ____________________________________________________________________ Ravi Varadhan, Ph.D. Assistant Professor, Division of Geriatric Medicine and Gerontology School of Medicine Johns Hopkins University Ph. (410) 502-2619 email: rvarad...@jhmi.edu ----- Original Message ----- From: Werner Wernersen <pensterfuz...@yahoo.de> Date: Thursday, August 6, 2009 7:56 am Subject: [R] solving system of equations involving non-linearities To: r-h...@stat.math.ethz.ch > Hi, > > I would appreciate if someone could help me on track with this problem. > > I want to compute some parameters from a system of equations given a > number of sample observations. The system looks like this: > > sum_i( A+b_i>0 & A+b_i>C+d_i) = x > sum_i( C+d_i>0 & C+d_i>A+b_i) = y > sum_i( exp(E+f_i) * ( A+b_i>0 & A+b_i>C+d_i) = z > > A, C, E are free variables while the other letters represent values > given from sample observations. The equations involve counts of the > number of fulfilled conditions and therefore non-linearities. > Furthermore, since I have many observations i, the equations will > unlikely hold exactly and solving will require some closeness measure > like the sum of the squared deviations or so. > > Is there any function in R suitable for solving this problem? > > Thanks so much for your help, > Werner > > > > > > ______________________________________________ > R-help@r-project.org mailing list > > PLEASE do read the posting guide > and provide commented, minimal, self-contained, reproducible code. ______________________________________________ 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.
