Pandigital Products: Euler Problem 32

Pandigital numbers

Euler Problem 32 returns to pandigital numbers, which are numbers that contain one of each digit. Like so many of the Euler Problems, these numbers serve no practical purpose whatsoever, other than some entertainment value. Euler Problem 32 in R asks to find the sum of all products whose multiplicand/multiplier/product identity can be written as a 1 through 9 pandigital.

Analysing soil moisture data in NetCDF format with the ncdf4 library

Analysing soil moisture data in NetCDF format with the ncdf4 library

The netCDF format is popular in sciences that analyse sequential spatial data. It is a self-describing, machine-independent data format for creating, accessing and sharing array-oriented information. The netCDF format provides spatial time-series such as meteorological or environmental data. This article shows how to visualise and analyse this data format by reviewing soil moisture data published by the Australian Bureau of Statistics.

Digit fifth powers: Euler Problem 30

Digit fifth powers: Euler Problem 30

A solution in R for Euler Problem 30: Digit fifth powers. Find the sum of all the numbers that can be written as the sum of fifth powers of their digits. Numberphile has a nice video about a trick to quickly calculate the fifth root of a number that makes you look like a mathematical wizard.

Visualising Water Consumption using a Geographic Bubble Chart

Visualising Water Consumption using a Geographic Bubble Chart

A geographic bubble chart is a straightforward method to visualise quantitative information with a geospatial relationship. Last week I was in Vietnam helping the Phú Thọ Water Supply Joint Stock Company with their data science. They asked me to create a map of a sample of their water consumption data. In this post, I share this little ditty to explain how to plot a bubble chart over a map using the ggmap package.