There are situations where you might want to use a specific Mathematical Programming solver and you might have to transform the mathematical model to comply with the API specifications of that Solver. Here I want to show you, how to adapt a Linear Model in order to run it within Matlab using the Gurobi solver.… Read more How to Solve Linear Models in Matlab using GUROBI
Run OSRM in Docker on Windows
After the OSRM routing service is no longer available on Windows we have a good reason to try to run it in a Docker container. However, there are some hurdles that have to be overcome in order to get your daemon up and running. SInce I’ve gone through this, I write down the necessary steps… Read more Run OSRM in Docker on Windows
Set-Operations on data.frames
Have you been loooking for a nice way to determine differences of sets of dataframes in R? There is a very cool package, part of the tidyverse from Hadley Wickham. See here, how simple it is to perform this task in R, with dplyr installed: If you would like to preserve the information contained in… Read more Set-Operations on data.frames
Change Local Library for R-Packages
You might have been wondering, that after having installed or updated your system to a new R version, the package installation Path within your RStudio still refers to your “old” location. In some situations, this might make sense. However, after changing to a completeley new version (main release number) of R, you might want to… Read more Change Local Library for R-Packages
How to deal with black printing PDFs?
Let’s just quickly print out the PDF and go to bed. That was my initial plan. However, the task turned out to be significantly more difficult. I started the printing job and did some other stuff, until the job was done. Times where one had to sit next to the 9-needle printer connected to one’s… Read more How to deal with black printing PDFs?
Marquee on a 8×8 LED Matrix Display run by a Battery powered Arduino Pro Mini
In this post I’ll show you how to implement a marquee running on an Arduino Pro Mini (5V). The project uses a slightly adapted version of the C source we developed for running the same project based on a Raspberry Pi 3B+. The main changes werd applied due to the two function void setup() and… Read more Marquee on a 8×8 LED Matrix Display run by a Battery powered Arduino Pro Mini
Font Design for Raspberry Marquee Project
Since the 8×8 LED Matrix Display I used in my marquee project is able to display 8×8 pixel sized letters and I am a great fan of the old Commodore 64 I designed the the font according to the C64 charset visible here: Based on the hardware reference provided here you can get the information… Read more Font Design for Raspberry Marquee Project
Solving the Rubik’s Cube using corners first method
Some time ago I organized a cubing-event in the quarter and presented the ‘algorithms’ – how move-sequences are called in the cuber-scene – to solve the rubik’s cube using the corners first method based on information provided by Victor Ortega. Here I present the material I developed in order to teach the people this method.… Read more Solving the Rubik’s Cube using corners first method
Create a Marquee with your Raspberry Pi
The aim of this project is to generate a marquee (scrolling text) using a Raspberry Pi and a 8×8 LED Matrix Display. If you don’t yet have a Pi, get one. I have bought a Raspberry Pi 3B+, which is powerful enough to run a Linux with a graphical UI. There are lots of web-shops… Read more Create a Marquee with your Raspberry Pi
Start programming you Pi
Here I describe the steps needed to start writing simple c programs on your raspberry pi. I did my experiments using a raspberry pi 3b+, you can use whatever model you like. If you don’t have a bootable SD card ready, please first follow the steps provided in this post. I installed ubuntu mate on… Read more Start programming you Pi