get_best_params {nlstac}

Get best-fit parameters

Description

Returns the best-fit parameters for a given nonlinear parameter bounds and nonlinear functions.

Usage

get_best_params(
  dat,
  form,
  functions,
  nlparam,
  lp,
  lp_bounds = NULL,
  lhs_var,
  N = 10,
  silent = TRUE,
  parallel = FALSE
)

Arguments

dat

Data frame with the data points to be fitted.

form

A formula given in the form "LHS ~ a1 * F_1(x,p1) + a2 * F_2(x,p2) + ... + an F_n(x,pn)"

functions

A string array with the nonlinear functions as obtained with get_functions functions.

nlparam

A list with the names of the nonlinear parameters and their lower and upper bounds in the form c(lower,upper).

lp

A string array with the names of the linear parameters contained in the formula as obtained with get_parameters function

lp_bounds

An optional list with the bounding restrictions over the linear parameters.

lhs_var

The name of the left-hand-side of the formula

N

Size of the partition of the nonlinear parameters. Defaults to 10.

silent

Logical. If TRUE (default) supresses any warnings regarding the collinearity of the columns of the matrix in the determination of the best linear parameters.

parallel

Logical. If TRUE then multicore parallelization of for loops is done with the parallel package. Defaults to FALSE.

Details

This is an internal function called from nls_tac function. It is not intended for direct use.

Value

A list containing the strings for the nonlinear functions of the formula.