nlmrt (2013-8.10)

Functions for nonlinear least squares solutions.

nlmrt provides tools for working with nonlinear least squares problems using a calling structure similar to, but much simpler than, that of the nls() function. Moreover, where nls() specifically does NOT deal with small or zero residual problems, nlmrt is quite happy to solve them. It also attempts to be more robust in finding solutions, thereby avoiding 'singular gradient' messages that arise in the Gauss-Newton method within nls(). The Marquardt-Nash approach in nlmrt generally works more reliably to get a solution, though this may be one of a set of possibilities, and may also be statistically unsatisfactory. Added print and summary as of August 28, 2012.

Maintainer: John C. Nash
Author(s): John C. Nash [aut, cre]

License: GPL-2

Uses: minpack.lm, numDeriv, Rcgmin, Rvmmin, optimx
Reverse depends: colf, usl
Reverse suggests: nlsr

Released over 6 years ago.