# Fast Kriging and Geostatistics on Grids with Kronecker Covariance

## Documentation for package ‘snapKrig’ version 0.0.3

- DESCRIPTION file
- User guides, package vignettes and other documentation
- Package NEWS
- Package README

## Help Pages

anyNA.sk | Check for presence of grid points with missing data (NAs)
as.double.sk | Coerce grid values to numeric (double type)
as.integer.sk | Coerce grid values to integer
as.logical.sk | Coerce grid values to logical
as.matrix.sk | convert to matrix
as.vector.sk | Convert grid data to vector of specified mode
dim.sk | Grid dimensions
is.na.sk | Indices of grid points with missing data (NAs)
length.sk | The number of grid-points
Math.sk | Math group generics
mean.sk | Calculate the mean value in a grid
Ops.sk | Operations group generics
plot.sk | Heatmap plots
print.sk | Auto-printing
sk | Make a snapKrig grid list object
sk_cmean | Compute kriging predictor (or variance) for an sk grid
sk_coords | Return coordinates of a grid of points in column-vectorized order
sk_export | Convert "sk" grid to SpatRaster
sk_fit | Fit a covariance model to an sk grid by maximum likelihood
sk_GLS | Generalized least squares (GLS) with Kronecker covariances for sk grids
sk_LL | Likelihood of covariance model 'pars' given the data in sk grid 'g'
sk_nLL | Negative log-likelihood for parameter vector 'p'
sk_pars | Initialize Kronecker covariance function parameters for a sk grid
sk_plot | Plot grid data
sk_plot_pars | Plot the covariance structure of a snapKrig model
sk_plot_semi | Plot a semi-variogram
sk_rescale | Up or down-scale a sk grid by an integer factor
sk_sample_vg | Sample point pair absolute differences for use in semi-variogram estimation
sk_sim | Random draw from multivariate normal distribution for sk grids
sk_snap | Snap a set of points to a "sk" grid
sk_var | Generate a covariance matrix or its factorization
summary.sk | Grid summary
[.sk | Extract a sk list element (single-bracket access)
[<-.sk | Single-bracket assign
[[.sk<- | sk_methods.R Dean Koch, 2022 S3 methods for sk grid list objects