Example code for non-separable space-time models

This repository contains code for the examples in https://arxiv.org/abs/2006.04917, v3

• R/handle_packages.R Helper function for checking whether needed packages are installed
• R/S2C.R Helper functions for using FFT to convert between spectral densities and covariances
• R/covariance_computation.R Compute covariances. Can be run as source("R/covariance_computation.R")
• R/covariance_plots.R Make covariance plots, from data saved by the computation code. Can be run as source("R/covariance_plots.R")
• R/example_computation.R Compute prediction example data. Can be run as source("R/example_computation.R")
• R/example_plots.R Make prediction plot, from data saved by the example computation code. Can be run as source("R/example_plots.R")
• R/globaltavg Folder with multiple files for the global temperature example. See R/globaltavg/README.txt
• Makefile Makefile for the global temperature example, covariance plots, and simulation example. The full temperature analysis can be run in a terminal by the following sequence:

# Download, check and prepare the data:
make data
# Create the analysis mesh:
make mesh
# Plot the data and mesh (runs plot_data and plot_mesh):
make plot_pre
# Fit the models (runs model_fit and model_predict):
make model_fitting
# Produce tables and plots:
make results

For the covariance and example plots (automatically runs the covariance_computation and example_computation targets first unless the result files already exist:

make covariance_plots
make example_plots

Main location https://github.com/finnlindgren/spacetime-paper-code