wrappers
Wrappers for the C functions used in geoR
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.
- Keywords
- spatial, programming, interface
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.spatialfor 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:
returns a list with elements dist - the
distance between pairs of points, and diff - the difference
between the values of the attributes.
returns a \(n \times N\) matrix with distances between data points and prediction locations.
returns a vector with the diagonal term of the quadratic form \(X' A X\).
returns a vector or a matrix with the terms of the quadratic form \(X' A Y\).
returns the lower triangle of the correlation matrix, including the diagonal.
returns a vector of values of spatial correlations.
References
Further information on the package geoR can be found at: http://www.leg.ufpr.br/geoR.