Monthly Archives: August 2018

Recommended: r2d3: R Interface to D3 Visualizations

There’s an interesting visualization system called d3, that I only became aware of a few months ago. It uses a fairly minimal system, javascript and support vector graphics, but is capable of producing tremendously rich graphics. I’ve tried, when I have a few spare moments, to learn d3. It’s not that complicated, but I am hindered by a lack of knowledge about javascript. It’s also difficult to debug a d3 program. There’s a new library in R that should make things a bit easier for someone like me. It’s called r2d3 and is being promoted with the new preview release of RStudio. Continue reading

Recommended: How to Clone Your Raspberry Pi SD Cards With Windows

I’m building a cluster of Raspberry Pi computers to run Hadoop and one of the tasks that I need is to make working backups of the micro SD cards that these computers use to store their operating system. This page takes you carefully through all the steps you need to make a backup and then to restore it to a different micro SD card. Continue reading