Latest blog posts – siko1056

Seminar notes mathematical optimization

math

octave

Today I completed my seminar notes about selected topics in mathematical optimization: optimality conditions for finite-dimensional (un-)constrained continuous problems…

Using directed rounding in Octave/Matlab

matlab

octave

The current IEEE Standard for Floating-Point Arithmetic specifies several rounding modes, which have become accessible to the C/C++ programming languages as part of the C99, …

Talk (online) at the JST/CREST meeting

octave

talk

The slides about the arbitrary precision arithmetic (APA) toolbox of my talk at the “JST/CREST”Development of Verified Numerical Computations for Mathematical Modeling”…

Bring your own Octave

octave

Thanks to the efforts of many developers, GNU Octave can be installed on all commonly used Linux distributions today. If the native distribution Octave package is out of…

SavannahAPI - A more systematic overview about bugs and patches

octave

web

The GNU Octave project is registered on the code hosting platform GNU Savannah since April 2002. With about 10,000 of 60,000 bugs, Octave is one of its biggest and most…

Tell me about the world

octave

A short demonstration using pkg-json with GNU Octave to plot a simplified two dimensional political “World Map” from public available JSON data provided by the NASA. The…

Support for the JSON data format after GSoC 2020

octave

The Google Summer of Code (GSoC) 2020 is over and I had the pleasure to mentor Abdallah Elshamy, who enriched Octave with the jsondecode() and jsonencode() functions. A…

rsync boosted Buildbots

octave

Using rsync instead of Buildbot’s own file transfers, which are known to be slow, significantly reduced the file transfer time between the Buildbot Workers and the Buildbot…

Fresh brewed Octave - every day!

octave

The octave-buildbot Server and Worker matured a lot in the past two months since I wrote about them in August. Finally, the system is capable of delivering once per day a…

Support for the JSON data format after GSoC 2020

octave

The Google Summer of Code (GSoC) 2020 will end with this August. I had the pleasure to mentor Abdallah Elshamy working on the implementation of the jsondecode() and jsonencod…

octave-buildbot: Less painful Octave releases?

octave

Since the minor Octave 5.2 release this January, I experienced that building and especially releasing Octave is still a difficult task. Even worse, due to some nasty bugs and…

Boosting the Octave hilb function

math

octave

Today, I read an interesting article about Hilbert Matrices in N. Higham’s blog and stumbled over these simple elegant two lines:

Testing the OctaveCoder

octave

On June 4th there arrived an extraordinary mail by Hossein on the Octave maintainers mailing-list. To my knowledge he has not been involved into Octave development so far.…

Can git and Mercurial work together?

linux

octave

Many popular source code hosting services do not support Mercurial (in short “hg”). After Bitbucket announced the “sunsetting” of Mercurial repositories in April 2020, only…

Talk at LSPANC 2020 in Kobe, Japan

container

linux

octave

talk

My slides and the white-paper of the “Workshop on Large-scale Parallel Numerical Computing Technology” (LSPANC 2020) at RIKEN.

Talk about Octave at the University of Tokyo

octave

talk

This Christmas I had the honor to give a seminar talk at the University of Tokyo, which was organized by JSIAM.

Talk: Scientific programming with GNU Octave

octave

talk

At the Shibaura Institute of Technology I was given the opportunity to talk about GNU Octave.

Protect your server using fail2ban

linux

web

While reading the system journal of my server, I noticed a bunch of evil looking entries and finally found in the Python tool fail2ban a satisfying but not an overall answer…

Setting up JupyterHub on openSUSE Leap 15.0

linux

web

In a previous blog post the setup of the Apache2 webserver including TLS was explained. Based upon that effort, this blog post deals with the setup of JupyterHub. The goal…

Setting up an apache2 webserver on openSUSE Leap 15.0

linux

web

The goal of this blog post is to properly remember what I did to create my root-server setup using openSUSE Leap 15.0:

Talk at the OctConf 2017 at CERN

octave

talk

The slides of today’s talk at the OctConf2017 at CERN are available here.

Getting to know the MediaWiki API

web

This article is a short introduction to the MediaWiki action API, in the following just called API. The API enables to edit and upload content to a MediaWiki by simple HTTP G…