Mini summary on how to solve linear equations in Krylov subspaces
23 mins
A write up of the methods used to iteratively solve arbitrary linear equations systems. This includes the definition of Krylov subspace solvers, the Lanczos and Arnoldi algorithm to build orthogonal subspaces, a summary of the steepest descent and projective methods and then as an real world realization of projective methods the conjugate gradient (CG) and generalized minimal residual (GMRES) method.
Solving linear least squares problems using QR decomposition
7 mins
Mini article on how one can solve the linear least squares problem numerically using QR matrix decomposition
Whats the Bayesian rule and how to apply for simple tests
10 mins
Due to still common demand this is a short summary of the Bayesian rule for single events as well as a calculator that uses estimated prevalence, sensitivity and specificity, puts these values into Bayes rule and calculates the probabilities for correct and false results.
QR decomposition using Givens rotations
7 mins
Mini recipe and hopefully descriptive summary on how to perform QR decomposition using Givens rotations which forms the basis of many linear algebra numeric applications such as least squares, GMRES, etc.
Gold plating on copper surfaces
8 mins
A summary on a procedure on how to use a galvanic process to plate copper (and other metallic surfaces) with gold using a galvanic bath
Rendering static two dimensional electric fields caused by point charges using Python
8 mins
A mini summary on how one can use Python and matplotlib to calculate and render two dimensional static electric fields generated by point charges in infinitly sized space based on Coulombs law and the superposition principle.
The capstan equation
3 mins
A summary on how to derive the capstan equation describing the friction of a rope on a bollard, winch or a capstan
Recipe how to recover Jenkins plain secret text credential via the web user interface
1 min
This short recipe explains how one can recover a Jenkins secret text credential directly using only the web interface
A short story of the migration process for The-Things-Network v2 to v3
8 mins
This article is a mini summary of the steps that have been required to migrate from the v2 to the v3 stack of the things network, a community driven LoRA-WAN backend solution.
Writing daemons in python
4 mins
Mini (really short) summary of one way as well as a recipe on how to write daemons in python
