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Unusual instruments in Vietnam

The nose flute The Duo A’Reng, a primitive talkbox!

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Uncategorized

Getting back into operations research

For the last five years, I have been fascinated with machine learning techniques, but that fascination is slowly running out. I increasingly consider ML a tool in my tool box among others, not a panacea to all problems. In particular, I’d like to return to other algorithmic techniques from my educational back, i.e. computer science. […]

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Good Book, Bad Program

Programming is like writing a book. Both programs and books are written in a language, e.g. Datalog or Tagalog, but the similarity goes deeper than that. Imagine that you must write a book with the subject "a man walks his dog". There are endless ways to write that book, but only a few of them […]

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Fun and trivia Geography

Comparing the Corona outbreak in Scandinavia and South/South-East Asia

I have read the WHO’s sitreps on CoViD-19 daily since the end of January 2020, where I was visiting Viet Nam. I now live in Denmark (a Scandinavian country) where the Corona virus has shut down society and many people have tested positive. When I compare the numbers for Scandinavia (Denmark, Norway, Sweden) with a […]

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Family Fun and trivia

My Sagawind 20

Through hulls on Sagawind 20 This year I bought an old sail boat from 1979 – a Sagawind 20. My first order of concern is to check the location and state of the through hulls, which are perhaps the most critical part of a sail boat. There is literally a hole through the hull! Special […]

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Audio and video Fun and trivia Hardware

London Pirate Radio Documentaries

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AI

How to compute and plot Bollinger BandsĀ® in Python

The aim is to produce a plot like this. The orange line is your data, the green line is the upper "bollinger" band, the blue line is the lower "bollinger" band. The red dots indicate where your data is either above or below the bands. Copy-paste this code: import pandas as pd import numpy as […]

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Hacking 101

See who is hosting a website

To see who is hosting a website (e.g. netflix.com), you will need the IP address of the website and the WHOIS record for that IP address. You can obtain both from the command-line. Obtain the IP address for netflix.com: # Ping the website ping netflix.com # Alternatively, use traceroute and note the last IP address […]

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Hacking 101

How to chat between computers using netcat on Mac and Linux

In our home we have a mix of Mac and Linux computers. My children have a Raspberry Pi in their room and I have a Mac at my desk. Today we chatted with each other through the Terminal running on both computers. Hi children! Dudududududududu Am I talking to a bird? ^v^ (It was a […]

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Hacking 101

How to discover devices on your network (Mac/Linux)

There are several ways to check what devices are currently logged on to your network (e.g. WiFi at home). The first option is to use arp, which I have found works the best. There will be some cases where it does not work. In the following example, I’ll assume that your IP address is 192.168.1.xxx. […]