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…
kostas
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…
Our Sagawind 20
Through hulls on Sagawind 20 This year we 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…
London Pirate Radio Documentaries
How to compute and plot Bollinger Bands® 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…
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: #…
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…
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…
Frk. Slimas Fornemmelse for Snot
Af Kostas Kefaloukos Danmark er et lille halvkoldt land, halvlangt mod nord. Det er ikke så koldt at der er særligt meget sne. Til gengæld blæser det meget og regner hele tiden. Disse vejrforhold gør at danskerne ofte bliver forkølede…
How to scrape images from the web
I’m interested in object detection and other computer vision tasks. For example, I’m working on a teddy-bear detector with my son. So, how do you quickly download images for a certain category? You can use this approach that I learned…