parscale.famos

From FAMoS v0.1.0 by Michael Gabel

Control Function for Optim

This function is designed to use the built-in option parscale in optim with absolute scaling values.

Usage

parscale.famos(par, scale, fix = 1, correction = NULL)

Arguments

par: A vector containing the values of the original parameters.
scale: A vector containing the corresponding absolute scaling values that will be used during the first steps in optim.
fix: Integer containing the index of the parameter that will be scaled by 10% of its original value, meaning the corresponding entry in scale will be overwritten (parscale in optim needs one value like this). Default to 1.
correction: Used for scaling newly added parameter values by their original scale as specified in init.par in famos. Default to NULL.

Value

A vector that can be used to scale parscale in optim accordingly.

Examples

# NOT RUN {
test.func<-function(x){
print(x)
3*x[1]+4*x[2]
}

pars <- c(1, 1000, 10)
scaling <- c(0.1, 3000, 10)

p.scale <- parscale.famos(par = pars, scale = scaling)

optim(par = pars, fn = test.func, control = list(maxit = 10, parscale = p.scale, trace = TRUE))

# }

Documentation reproduced from package FAMoS, version 0.1.0, License: GPL-3

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