wrappers: Wrappers for the C functions used in geoR
In geoR: Analysis of Geostatistical Data

wrappers

R Documentation

Wrappers for the C functions used in geoR

Description

These functions are wrappers for some (but not all) the C functions included in the geoR package.
Typically the C code is directly called from the geoR functions but these functions allows independent calls.

Usage


diffpairs(coords, data)
loccoords(coords, locations)
.diagquadraticformXAX(X, lowerA, diagA) 
.bilinearformXAY(X, lowerA, diagA, Y) 
.corr.diaglowertri(coords, cov.model, phi, kappa)
.Ccor.spatial(x, phi, kappa, cov.model)

Arguments

`coords`	an `n \times 2` matrix with the data coordinates.
`data`	an vector with the data values.
`locations`	an `N \times 2` matrix with the coordinates of the prediction locations.
`lowerA`	a vector with the diagonal terms of the symmetric matrix A.
`diagA`	a vector with the diagonal terms of the symmetric matrix A.
`X`	a matrix with conforming dimensions.
`Y`	a matrix with conforming dimensions.
`cov.model`	covariance model, see `cov.spatial` for options and more details.
`phi`	numerical value of the correlation function parameter phi.
`kappa`	numerical value of the correlation function parameter kappa.
`x`	a vector of distances.

Value

The outputs for the different functions are:

`diffpairs`	returns a list with elements `dist` - the distance between pairs of points, and `diff` - the difference between the values of the attributes.
`loccoords`	returns a `n \times N` matrix with distances between data points and prediction locations.
`diagquadraticformXAX`	returns a vector with the diagonal term of the quadratic form `X' A X`.
`bilinearformXAY`	returns a vector or a matrix with the terms of the quadratic form `X' A Y`.
`corr.diaglowertri`	returns the lower triangle of the correlation matrix, including the diagonal.
`Ccor.spatial`	returns a vector of values of spatial correlations.