I’ve had to brush up my Docker skills again due to some side projects I’m working on. So I ran into some basic issues I wanted to elaborate on. In this blog post: “image is referenced in multiple repositories.” I had to remove a Docker image from my machine using…
I’ve been dockerizing web scrapers in order to add them in a data pipeline. Web scraping is always a little bit of living on the edge because you never know which elements might have changed and which errors will pop up. In this blog post I would like to elaborate…
I was running a scraping job from a Docker container using Python and the psycopg2 adapter that wrote the results to a Postgres database managed on DigitalOcean (DO). On random occasions, the container died, for some reason. I started debugging and these are my findings. The error I ran into…
One of the most widely used technical indicators in technical analysis is the Relative Strength Index. It measures the magnitude of recent price evolutions to evaluate if a price of an asset is overbought or oversold. In this blog post, I list the many ways you can calculate the RSI…
Using TA-Lib in a Jupyter notebook isn’t straightforward, and using it in a hosted solution like Deepnote could use a tutorial too. In this blog post, we’ll set up the popular Python wrapper for TA-lib. A prerequisite for installing the TA-lib Python wrapper is that you have the TA-lib library…
The recent crypto bull market got me interested in chartist approaches to trading strategies. I’ve always wanted to use Deepnote‘s notebook solution, so I decided to combine my newfound hobby of algorithmic trading with my new tool craving. I started using Backtrader in Deepnote, but that produced some plotting issues.…
When I got my new company computer, out service desk installed R in a network folder, which made installing and loading R libraries extremely slow. That’s why I reinstalled R and needed to set my library directory explicitly, so that R doesn’t look in the network folder with every package…
In this blog post, we’ll use media queries particular user (device) properties using Google Tag Manager and Google Analytics 4. Some JavaScript knowledge is not a luxury. Using media queries, developers can personalize their app or website based on device and personal preferences by the user. Using the matchMedia method…
If you’re new to VirtualBox, some things might be confusing. When you run into the following error, it means you haven’t installed an Operating System in your virtual machine. But, didn’t I select an OS when creating the image? Do you see the word “intend” in the description? That means…
Calculating the number of days between two dates in R is as simple as using + or -. However, if you only want to count the business days (e.g. in a B2B context), you’ll have to be a little more creative. Let’s just do that. Count business days in R…