There are three files inside the simplespectro zip-file which accompanies the book 'A Primer on Fourier Analysis for the Geosciences', 2019, Robin Crockett, Cambridge University Press, ISBN-10: 1316600246 / ISBN-13: 978-1316600245.

1. This README file.

2. A text version of the GNU General Public License, Version 2, as available at:
https://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
https://www.r-project.org/Licenses/LGPL-2

3.	The file simplespectro_1.tar.gz. This contains the spectrogram code and help-file in a standard R package-source gzipped-tar archive format. The code was written on R versions 3.3.3 - 3.5.1 running on macOS and Linux. It has also been installed and run on R version 3.5.1 running on Windows 10.

A. To install and run the code.

i) Save the simplespectro_1.tar.gz in a local directory that you can conveniently access from the R console, or GUI / IDE environment if you are running R inside a GUI / IDE front-end.

ii) From inside R or GUI / IDE front-end, install the package in the normal manner for a local package file.

B. To access the code.

i) The code is in the simplespectro.r file inside the gzipped-tar archive. The code is as listed in Appendix B and can be re-typed, in whole or in part, from that listing.

ii) However, if you wish to access the code to avoid / minimise re-typing, you will need to (a) gunzip and then (b) untar the archived file as appropriate for your operating system.



Robin Crockett.
25 November 2018.