EnviroStat (version 0.4-2)

Ftransdraw: Interactively choose smoothing parameter value

Description

An interactive function showing the fitted variogram and the mapping transformation from the geographical space into D-space, allowing the user to interactively choose a suitable value for the smoothing parameter ("lambda").

Usage

Ftransdraw(disp, Gcrds, MDScrds, gridstr, sta.names, lambda = 0, lsq = FALSE, eye, model = 1, a0 = 0.1, t0 = 0.5)

Arguments

disp

$n \times n$ dispersion matrix, equal to $2-2 (spatial correlation matrix)$

Gcrds

$n \ times 2$ coordinate matrix (in G-space)

MDScrds

Coordinates of new locations -- as calculated by Falternate3

gridstr

grid coordinates, obtained from Fmgrid using Gcrds as input

sta.names

names of locations; if not provided, locations will be numbered 1 to n

lambda

initial value of the smoothing parameter

lsq

logical flag used in Sampson-Guttorp method

eye

eye perspective; if not provided, locations will be selected using the provided data

model

type of variogram: 1 for exponential or 2 for gaussian

a0, t0

initial variogram parameter estimates

Value

A list containing the following named components:

Dcrds

$n \times 2$ cooridnate matrix of new locations in D-space

Ddist

$n \times n$ matrix of interdistances in D-space