R: Initialize a Basic Structure

melem.init {RGeostats}

R Documentation

Initialize a Basic Structure

Description

Initialize a new melem-class

Usage

melem.init(ndim=2, nvar=1, vartype=melem.name(3), range=NA, scale=NA, sill=NA,
           param=1, order=0, flag.aniso=FALSE, aniso.rotmat=NA,
           aniso.angles=NA, flag.check.sill=FALSE)

Arguments

`vartype`	Type of the Basic Structure to be created. By default, this type corresponds to the Nugget Effect. The list of types available is: Nugget effect Exponential Spherical Cubic Gaussian Cardinal Sine J-Bessel K-Bessel Gamma Cauchy Stable Linear Cosinus (1D) Triangle (1D) Cosine Exponential Exp2dfact Expfact Reg1D (1D) Pentamodel Power Order-1 GC Some are restricted to 1-D case. The two last types should be discarded when building a covariance Model
`ndim`	Space dimension.
`nvar`	Number of variables.
`range`	This parameter provides the range that should be attributed to the new Basic Structure (if required). Its contents depends on the isotropy / anisotropy characteristics defined in argument 'flag.aniso'. In the isotropic case, this argument corresponds to the isotropic range of the basic structure. In the anisotropic case, this argument must be a vector (dimension equal to 'ndim'): the i-th element is the extension of the anisotropic ellipsoid in the i-th direction (after rotation). Otherwise an error is issued.
`scale`	Theoretical range(s) of the new basic structure. If not defined (but needed for this type of basic structures), range can be defined instead. Depending on the isotropic / anisotropic case, the argument 'scale' must be either a single value or a vector (see 'range' for details).
`sill`	This parameter provides the matrix of sills that should be attributed to the new Basic Structure (if required). The dimension of the matrix is 'nvar'.
`param`	This parameter provides the third parameter that should be attributed to the new Basic Structure (if required).
`order`	Parameter giving the maximum order of the IRF which corresponds to the model defined. If mode=-1, only covariances can be entered; if mode=0, all covariances and variograms are allowed.
`flag.aniso`	This parameter is used to specify that the new Basic Structure if anisotropic.
`aniso.rotmat`	This parameter provides the rotation matrix which defines the main axes of the rotation ellipsoid. It may not be used together with argument 'aniso.angles'.
`aniso.angles`	A vector giving the set of rotations. See `util.ang2mat` for details. It may not be used together with argument 'aniso.rotmat'.
`flag.check.sill`	When TRUE, the matrix of sill for each covariance component is checked against definite positiveness. This constraint is too severe for the whole model to be valid: therefore it is only optional.

Value

The new melem-class Basic Structure.

[Package RGeostats version 14.0.10 Index]