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Elmar Klausmeier's Blog on Computers, Programming, and Mathematics (Page 1)
Elmar Klausmeier · 2025-05-06 · via Ye Olde Blogroll — Firehose

Stability Mountains for Fredebeul's Formulas

, 94 min read

Beware, this three-dimensional graphic needs some time to load. You can rotate the graphic around any axis. Here we analyze the three methods from Christoph Fredebeul, which were mentioned in Albrecht (1989). These are three cyclic linear multistep methods of order $p=3$ and $p=4$. They should not…

Blocking HTTP 404 traffic

, 4 min read

1. Problem statement: There are some bots which requests lots of pages of my web-server, which do not exist. These bots are blocked on the network level with iptables. Here is an example of excessive HTTP 404 errors: 34.165.43.146|04/Jun/2026:12:43:33 +0200|404|14589|GET /backup.zip…

Stability Mountain for Runge-Kutta 4

, 26 min read

Beware, this three-dimensional graphic needs some time to load. You can rotate the graphic around any axis. The classical Runge-Kutta method of order 4 with 4 stages. $$ \begin{array}{c|cccc} {1\over2} & {1\over2}\\ {1\over2} & 0 & {1\over2}\\ 1 & 0 & 0 & 1\\ …

Cyclic Combination of BDF

, 2 min read

1. Backward differentiation formulas. The BDF are as follows. Name Formula BDF1 $y_{n+1} - y_n = h f_{n+1}$ BDF2 $3 y_{n+2} - 4 y_{n+1} + y_n = 2 h f_{n+2}$ BDF3 $11 y_{n+3} - 18 y_{n+2} + 9 y_{n+1} - 2 y_n = 6 h f_{n+3}$ BDF4 $25 y_{n+4} - 48 y_{n+3} + 36 y_{n+2} - 16 y_{n+1} + 3 y_n…

Texts on Machine Learning

, 3 min read

1. Optimization Some texts from Elad Hazan. Introduction to Online Convex Optimization Lecture Notes: Optimization for Machine Learning Introduction to Online Control Second order methods by James Martens et al. Deep learning via Hessian-free optimization On the importance of initialization and…

TENDLER: 8. Ausblick

, 15 min read

Fortsetzung der TENDLER Programmbeschreibung. TENDLER: 1. Grobaufbau und prinzipielle Überlegungen TENDLER: 2. Benutzung des Programmes TENDLER: 3. Der Prädiktor TENDLER: 4. Die Korrektoriteration TENDLER: 5. Die Fehlerkontrolle TENDLER: 6. Die Schrittweiten- und Ordnungssteuerung TENDLER: 7.…

Citrix Alt Gr Keyboard Problem

, 1 min read

1. Problem statement: You access a Windows machine, while running on Linux using Citrix. You can no longer type characters like ~, |, [, ]. These are characters where you must press the key Alt Gr on a German keyboard. 2. Solution. The following configuration added to ~/.ICAClient/wfclient.ini…

Das Schalten im Programm PAI4

, 9 min read

Schalten in Programmen. TENDLER: 7. Start, Statistiken und Schalten Das Schalten im Programm LSODA Das Schalten im Programm DEASY Das Schalten im Programm RKF4RW Das Schalten im Programm NTI/SIMPLE Das Schalten im Programm PAI4 1. Kurzbeschreibung des Programmes PAI4 2. Bewertung und Vergleich…

Das Schalten im Programm NTI/SIMPLE

, 7 min read

Schalten in Programmen. TENDLER: 7. Start, Statistiken und Schalten Das Schalten im Programm LSODA Das Schalten im Programm DEASY Das Schalten im Programm RKF4RW Das Schalten im Programm NTI/SIMPLE Das Schalten im Programm PAI4 Inhalt. 1. Die Schaltentscheidung im Programm NTI/SIMPLE 2.…

Das Schalten im Programm RKF4RW

, 13 min read

Schalten in Programmen. TENDLER: 7. Start, Statistiken und Schalten Das Schalten im Programm LSODA Das Schalten im Programm DEASY Das Schalten im Programm RKF4RW Das Schalten im Programm NTI/SIMPLE Das Schalten im Programm PAI4 1. Kurzbeschreibung des Programmes RKF4RW 2. Bewertung des…

Das Schalten im Programm DEASY

, 13 min read

Schalten in Programmen. TENDLER: 7. Start, Statistiken und Schalten Das Schalten im Programm LSODA Das Schalten im Programm DEASY Das Schalten im Programm RKF4RW Das Schalten im Programm NTI/SIMPLE Das Schalten im Programm PAI4 1. Kurzbeschreibung des Programmes DEASY 2. Die nichtlineare von…

Das Schalten im Programm LSODA

, 29 min read

Schalten in Programmen. TENDLER: 7. Start, Statistiken und Schalten Das Schalten im Programm LSODA Das Schalten im Programm DEASY Das Schalten im Programm RKF4RW Das Schalten im Programm NTI/SIMPLE Das Schalten im Programm PAI4 1. Kurzbeschreibung des Programmes LSODA 2. LSODAR und…

Häufig vorkommende Test-Differentialgleichungen

, 30 min read

1. Die steifen Gleichungen aus STDTST 2. Die nicht-steifen Gleichungen aus NSDTST 3. Weitere Testgleichungen 4. Literatur The fragments of theory available for stiff problems give a great deal of attention to model problems. L.F. Shampine (1980) Es [das Buch] zeigt auch, wie der Numeriker…

Failed Experiment: Advertisement on a niche blog

, 1 min read

This blog is a niche blog. Its topics are computer programming, mathematics, and computer hardware. Each month I have roughly one thousand real visitors reading blog posts. Posts on this blog are not dictated by any commercial requirement, they are solely governed by my current interest. It costs…

TENDLER: 7. Start, Statistiken und Schalten

, 36 min read

Fortsetzung der TENDLER Programmbeschreibung. TENDLER: 1. Grobaufbau und prinzipielle Überlegungen TENDLER: 2. Benutzung des Programmes TENDLER: 3. Der Prädiktor TENDLER: 4. Die Korrektoriteration TENDLER: 5. Die Fehlerkontrolle TENDLER: 6. Die Schrittweiten- und Ordnungssteuerung TENDLER: 7.…

TENDLER: 6. Die Schrittweiten- und Ordnungssteuerung

, 41 min read

Fortsetzung der TENDLER Programmbeschreibung. TENDLER: 1. Grobaufbau und prinzipielle Überlegungen TENDLER: 2. Benutzung des Programmes TENDLER: 3. Der Prädiktor TENDLER: 4. Die Korrektoriteration TENDLER: 5. Die Fehlerkontrolle TENDLER: 6. Die Schrittweiten- und Ordnungssteuerung TENDLER: 7.…

TENDLER: 5. Die Fehlerkontrolle

, 25 min read

Fortsetzung der TENDLER Programmbeschreibung. TENDLER: 1. Grobaufbau und prinzipielle Überlegungen TENDLER: 2. Benutzung des Programmes TENDLER: 3. Der Prädiktor TENDLER: 4. Die Korrektoriteration TENDLER: 5. Die Fehlerkontrolle TENDLER: 6. Die Schrittweiten- und Ordnungssteuerung TENDLER: 7.…

Stability Mountain for Majid/Suleiman/Omar

, 5 min read

Beware, this three-dimensional graphic needs some time to load. You can rotate the graphic around any axis. Here we analyze the method from Majid/Suleiman/Omar. This is a block implicit method of order 4. $$ \begin{array}{r|rrr} p=4 & 1 & 2 & 3\cr \hline -1 & -24 & 0 & 0 \cr 0 & 24 & -24 &…

Searching for Tendler-like formulas, #3

, 59 min read

1. Order 3 2. Order 4 3. Order 5 4. Order 6 5. Order 7 6. Order 8 7. Order 9 This post is a continuation of Searching for Tendler-like formulas Searching for Tendler-like formulas, #2 Here we search for further Tendler-like formulas. We extended stabregion2.c to stabregion3.c to include higher…

Searching for Tendler-like formulas, #2

, 7 min read

1. Order 3 2. Order 4 3. Order 5 4. Order 6 5. Order 7 6. Order 8 7. Order 9 In continuation of Searching for Tendler-like formulas here we search for further Tendler-like formulas. This time we particularly watch for low error constants. For reference, below are Widlund-wedge angle α and…