Articles about data science, mathematics, and programminghttps://rikvoorhaar.com/enhttps://rikvoorhaar.com/blog/ijzer/https://rikvoorhaar.com/blog/ijzer/I made an array programming language as a language extension to RustWed, 15 Jan 2025 00:00:00 GMThttps://rikvoorhaar.com/blog/selfhosted/https://rikvoorhaar.com/blog/selfhosted/Self-hosting your own cloud services not only saves money, it is also a great way to learnThu, 01 Aug 2024 00:00:00 GMThttps://rikvoorhaar.com/blog/ukf/https://rikvoorhaar.com/blog/ukf/In my first dive into Rust, I implemented an unscented Kalman filter in and made it 20x faster than the equivalent Python implementation.Sat, 07 Oct 2023 00:00:00 GMThttps://rikvoorhaar.com/blog/dashboard/https://rikvoorhaar.com/blog/dashboard/I made an interactive dashboard for this website, and here is the story of how I did it.Mon, 01 May 2023 00:00:00 GMThttps://rikvoorhaar.com/blog/thesis/https://rikvoorhaar.com/blog/thesis/Read this blog post if you're curious what I worked on during my PhD!Sun, 26 Feb 2023 00:00:00 GMThttps://rikvoorhaar.com/blog/gmres/https://rikvoorhaar.com/blog/gmres/Linear least-squares system pop up everywhere, and there are many fast way to solve them. We'll be looking at one such way: GMRES.Tue, 29 Mar 2022 00:00:00 GMThttps://rikvoorhaar.com/blog/discrete_function_tensor/https://rikvoorhaar.com/blog/discrete_function_tensor/We recently made a paper about supervised machine learning using tensors, here's the gist of how this works.Thu, 10 Mar 2022 00:00:00 GMThttps://rikvoorhaar.com/blog/low_rank_matrix/https://rikvoorhaar.com/blog/low_rank_matrix/A lot of data is naturally of 'low rank'. I will explain what this means, and how to exploit this fact.Sun, 26 Sep 2021 00:00:00 GMThttps://rikvoorhaar.com/blog/python_docx/https://rikvoorhaar.com/blog/python_docx/Parsing and editing Word documents automatically can be extremely useful, but doing it in Python is not that straightforward.Sun, 29 Aug 2021 00:00:00 GMThttps://rikvoorhaar.com/blog/deconvolution_part4/https://rikvoorhaar.com/blog/deconvolution_part4/Finally, let's look at how we can automatically sharpen images, without knowing how they were blurred in the first place.Mon, 31 May 2021 00:00:00 GMThttps://rikvoorhaar.com/blog/deconvolution_part3/https://rikvoorhaar.com/blog/deconvolution_part3/Deconvolving and sharpening images is actually pretty tricky. Let's have a look at some more advanced methods for deconvolution.Sun, 02 May 2021 00:00:00 GMThttps://rikvoorhaar.com/blog/deconvolution_part2/https://rikvoorhaar.com/blog/deconvolution_part2/In order to automatically sharpen images, we need to first understand how a computer can judge how 'natural' an image looks.Fri, 09 Apr 2021 00:00:00 GMThttps://rikvoorhaar.com/blog/deconvolution_part1/https://rikvoorhaar.com/blog/deconvolution_part1/Deconvolution is one of the cornerstones of image processing. Let's take a look at how it works.Sat, 13 Mar 2021 00:00:00 GMThttps://rikvoorhaar.com/blog/email_datetime/https://rikvoorhaar.com/blog/email_datetime/I have 15 years worth of email traffic data, let's take a closer look and discover some fascinating patterns.Sat, 13 Feb 2021 00:00:00 GMThttps://rikvoorhaar.com/blog/bayes_exam/https://rikvoorhaar.com/blog/bayes_exam/We use exams to determine how much a student knows, but exams aren't perfect. How can we estimate the uncertainty in students' exams scores?Mon, 09 Nov 2020 00:00:00 GMThttps://rikvoorhaar.com/blog/validation_size/https://rikvoorhaar.com/blog/validation_size/Cross validation is extremely important, but how should we choose the size of our validation and test sets?Wed, 26 Aug 2020 00:00:00 GMThttps://rikvoorhaar.com/blog/lastfm/https://rikvoorhaar.com/blog/lastfm/I use last.fm to track my music listening. Let's look at my data to discover how my musical preferences evolve over time.Wed, 12 Aug 2020 00:00:00 GMThttps://rikvoorhaar.com/blog/normal_data/https://rikvoorhaar.com/blog/normal_data/Normally distributed data is great, but how do you know whether your data is normally distributed?Mon, 10 Aug 2020 00:00:00 GMThttps://rikvoorhaar.com/blog/figure_skating/https://rikvoorhaar.com/blog/figure_skating/Judging in figure skating is biased. Let's use data science to figure out just how bad the issue is.Sat, 20 Jun 2020 00:00:00 GMThttps://rikvoorhaar.com/blog/first_post/https://rikvoorhaar.com/blog/first_post/My first post in this blogFri, 19 Jun 2020 00:00:00 GMT