Publications by Peter Prevos
The Ulam Spiral (Euler Problem 28)
Euler Problem 28 takes us to the world of the Ulam Spiral. This is a spiral that contains sequential positive integers in a square spiral, marking the prime numbers. Stanislaw Ulam discovered that a lot of primes are located along the diagonals. These diagonals can be described as polynomials. The Ulam Spiral is thus a way of generating quadratic...
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Euler Problem 29: Distinct Powers
Euler Problem 29 is another permutation problem that is quite easy to solve using brute force. The MathBlog site by Kristian Edlund has a nice solution using only pen and paper. Raising number to a power can have interesting results. The video below explains why this pandigital formula approximates to billions of decimals: Euler Problem 29 Def...
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Using the iGraph package to Analyse the Enron Corpus
This blog post analyzes an extensive collection of e-mails from former Enron employees. The Enron corpus is analysed using network analysis tools provided by the iGraph package. Network analysis is a versatile technique that can be used to add value to a lot of different data sets, including the complex corporate relationships of Donald Trump. Th...
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The Viral Recurring Decimal: Euler Problem 26
Proposed solution to Euler Problem 26 in the R language. Find the value of d < 1000 for which 1/d contains the longest recurring decimal cycle. Continue reading → The post The Viral Recurring Decimal: Euler Problem 26 appeared first on The Devil is in the Data. Related To leave a comment for the author, please follow the link and comment on t...
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How Virtual Tags have transformed SCADA data analysis
This article describes how to use Virtual tags to analyse SCADA data. Virtual tags provide context o SCADA or Historian data by combining information from various tags with meta data about these tags. Continue reading → The post How Virtual Tags have transformed SCADA data analysis appeared first on The Devil is in the Data. Related To leave...
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Generating Quadratic Primes: Euler Problem 27
Solution to Euler Problem 27 using the R language. Find the product of the coefficients for the quadratic expression that produces the most primes. Continue reading → The post Generating Quadratic Primes: Euler Problem 27 appeared first on The Devil is in the Data. Related To leave a comment for the author, please follow the link and comment ...
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Data Science for Water Utilities Using R
Data science comes natural to water utilities because of the engineering competencies required to deliver clean and refreshing water. Many water managers I speak to are interested in a more systematic approach to creating value from data. My work in this area is gaining popularity. Two weeks ago I was the keynote speaker at an asset data confere...
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Data Science for Water Utilities Using R
Data Science for Water Utilities will be a new book that explains how to use R to undertake analytics for problems typical to water utilities. Continue reading → The post Data Science for Water Utilities Using R appeared first on The Devil is in the Data. Related To leave a comment for the author, please follow the link and comment on their b...
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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 t...
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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 … Continue reading → The post Visualising Water Consumption using a Geographic Bubble Ch...
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