R Interface to the Levenberg-Marquardt Nonlinear Least-Squares Algorithm Found in MINPACK, Plus Support for Bounds

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Documentation for package ‘minpack.lm’ version 1.2-2

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nls.lm Addresses NLS problems with the Levenberg-Marquardt algorithm
nls.lm.control Control various aspects of the Levenberg-Marquardt algorithm
nlsLM Standard 'nls' framework that uses 'nls.lm' for fitting
wfct Weighting function that can be supplied to the 'weights' argument of 'nlsLM' or 'nls'