, 42 min read
Matija Mihelcic and K. Wingerath searched for cyclic multistep methods, which were of high order p had a remarkable low number of stepnumbers k adhered to the condition of annulated dominance order p step k cycle length l 4 3 2 5 3 3 6 4 4 7 5 5 Bibliography: Matija (Miško)…
, 1 min read
From Thursday, 03-Jul-2025, starting at 23:10 (CET), internet provided by Vodafone was unavailable. The outage lasted until Friday, 04-Jul-2025, 06:40 (CET). I personally didn't notice anything until 06:00, as I was asleep. So for seven and a half hours I had no internet and the blog went…
, 26 min read
Ten years after Tendler's PhD in 1973, Peter Tischer finished his PhD thesis in 1983. He developed an array of cyclic multistep formulas, which are all stiffly stable. While Tendler found his formulas by guessing and experimenting, Tischer computed his formulas according the following…
, 68 min read
In Die verwendeten zyklischen Formeln im Programm TENDLER we listed the Widlund wedge α and Widlund distance δ for the seven formulas of Joel Tendler, which he developed during his PhD thesis in 1973. Here we compute these values by using the QZ algorithm. We list the values for the BDF (backward…
, 1 min read
Task at hand: extract all lines of a file, which do not have a specific line length. Example: Print out all lines, which do not have a line length of 171 and not 1370. Also see Line Length Distribution in Files. Below Perl one-liner does that, here for the line lengths 20 and 21: perl -ne 'print if…
, 3 min read
Task at hand: compute generalized eigenvalues for $$ A x = \lambda B x, \qquad A, B \in \mathbb{C}^{n\times n}, \quad x\in\mathbb{C}^n, \quad\lambda\in\mathbb{C} $$ using the C programming language and the Fortran library LAPACK. Previously I had used cqzhes() and cqzval() from EISPACK. 1.…
, 3 min read
Transcript produced by tokscript and corrected by Gemini. The video was made by dr_cal_ur_science_pal. She has more than 360 thousand followers on TikTok, and more than 4.8 million Likes. @dr.cal.ur.science.pal A team of doctors has just treated this woman's “untreatable” cancer using DNA…
, 5 min read
1. Introduction. The mainframe knows the notion of GDGs, i.e., Generation Data Groups. These are groups of files, which are handled as almost a single entity. Some notions. A GDG file consists of three parts in its file name: <GDG-Base>.G<generation>.V<version> The limit is the…
, 1 min read
Similar to the post My 10 Most Used Linux Commands by Jason Thai, here is a list of the most used commands on the command line in zsh. 11991 cd 8214 rsync 5398 ll 5206 v 5193 l 4254 time 4123 li 2490 git 2432 lh 2412 rg 2192 .. 1862 mv 1813 grep 1552 cat …
, 1 min read
PhD thesis from Joel Marvin Tendler from May, 1973. Completed under the direction of Prof. Dr. Theodore Bickart, Syracuse University. TendlerDiss1973.pdf
, 1 min read
PhD thesis from William Benjamin Rubin from May, 1973. Completed under the direction of Prof. Dr. Theodore Bickart, Syracuse University. RubinDiss1973.pdf
, 1 min read
On 31-Mar-2025 I visited the Joseph Regenstein Library in Chicago to scan two PhD dissertations. I had kept these two PhD thesis since 1990. In 1990 I could only read these two thesis on a microfilm reader. At that time there was no PDF. The Regenstein library of the University of Chicago offers…
, 26 min read
It is entirely possible, and even very likely, in view of the fact that the parameters $C_{ij}$ were “manually” set in an interactive computer search for the maximum $\alpha$, that better and simpler cyclic composite methods exist. An interested reader is invited to try the development of such…
, 2 min read
In below two posts I had already mentioned the close connection between neural networks and solving stiff ordinary differential equations: Neural Network Training using Stiff ODE Solvers Reply to: Neural Network Back-Propagation Revisited with Ordinary Differential Equations Below…
, 106 min read
I was asked how I build J-Pilot and Pilot-Link on Linux. 1. J-Pilot 2. Pilot-Link J-Pilot (Wikipedia) is a graphical application to manage dates and appointments addresses to-do's memos of all sorts various plugins, e.g., expenses J-Pilot was written by Judd Montgomery. 1. J-Pilot Below are…
, 48 min read
1. Definition von Stabilitätseigenschaften 2. Schreibweise zusammengesetzter Mehrschrittformeln 3. Stabilität und Polynome 4. Verschärfung von Stabilitätsdefinitionen 5. Konstruktive Herleitung steif-stabiler zyklischer Formeln 6. Basisformeln der Tendlerschen Zyklen 7. Äquilibrierung von…
, 148 min read
I had written on website analytics with regard to this blog before: Statistics of this Blog: Crossed 110.000 Views Statistics of this Blog: Crossed 120.000 Views URL Count Statistics I do not use cookies or any JavaScript libraries to track users. Instead I only analyze the web-server logs using…
, 4 min read
Simplified Saaze is a static site generator. This very blog uses Simplified Saaze. It is possible to generate all HTML files on Android using Simplified Saaze! This post shows the necessary steps. The main trick is to use termux. I had written on termux here: ssh and rsync for Android, Termux. 1.…
, 3 min read
Simplified Saaze is the static site generator used for this very blog. There are a number of themes for Simplified Saaze: Saaze example, a pure example theme, simple to use and modify J-Pilot, showcasing an open-source software project and having a hierarchical menu Koehntopp, a blog for a…
, 3 min read
Myra West has a YouTube channel, where she mostly talks about friendship, relationship, personal journey as a yound adult. Below video "21 Years Old: I Have NO Friends" went viral and hit more than six million views. Myra West has no blog. Below are the steps to convert her YouTube talks…