Calculate starting values for an ARF model

Description

determineStartRect calculates starting values for an ARF model by searching for maxima and minima in the data, and estimating the width of these maxima/minima.

Usage

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determineStartRect(arfmodel, options = loadOptions(arfmodel))
determineStartRectSimple(arfmodel, options = loadOptions(arfmodel))

Arguments

arfmodel

An ARF model object (class model)

options

An "options" object (class options), by default the options.Rda from the current model is loaded. The value of options@start.maxfac determines the calculation of the spatial extent values, higher settings will lead to greater extent values.

Details

determineStartRect determines the maxima and minima of the data and at each maximum/minimum searches in each dimension (x,y,z) the point where the maximum/minimum value is half its original value. This creates a box around the maximum/minimum, which is set to zero, to avoid searching the same area twice. The widths of this box are taken as starting values for the width-parameters.

Value

Returns the ARF "model" object, with the starting values in the @startval slot.

Author(s)

Wouter D. Weeda - w.d.weeda@gmail.com

See Also

model, options

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