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' |