Example You have a user table in Postgres: CREATE SCHEMA tutorial; CREATE TABLE tutorial.crud_users ( id INT NOT NULL, username VARCHAR NOT NULL, CONSTRAINT crud_table_pkey PRIMARY KEY (id) ); You insert new users and update usernames for existing users. Update…
The nose flute The Duo A’Reng, a primitive talkbox!
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,…
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…
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…
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…
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…
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: #…
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…