Spline Approximation (Introduction)

We sometimes encounter a situation where a number of points with coordinates are given and we want to find a function such that for all of these points we have (interpolation) or (approximation). Most often we say that we want on average to be as small as possible and for whatever reasons usually the quadratic …

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Addresses

Postal addresses seem to be easy: – Name and/or Company – Street and/or PostBox – ZIP Code – Municipality – Country This is true in Germany or Switzerland and a few other countries. I would like to add, that in some large buildings it can be a good idea to add the apartment number, but …

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Functional Scala

I participated online in the conference „Functional Scala 2020“ in London. That it was in London had mostly one relevance, which was the time zone. There was no physical location and all talks were done online. An interesting idea was a virtual location. It consisted of rooms and we could move a dot representing ourselves …

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How to disable touchpad (on Linux/X11)

For me it is much better to use an external mouse than the touchpad, which I sometimes touch accidentally. So, here is how to disable it with a short Perl-Script. A bash script with a bit of Perl would do the same, btw. #!/usr/bin/perl my $tp = `xinput list | egrep -i touch`; chomp $tp; …

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Devoxx UA 2020 (talks)

I watched the conference onlie and picked the following talks: The Effective Developer – Work Smarter, Not Harder by Sven Peters Polyglot, Fault-Tolerant Event-Driven Programming with Kafka, Kubernetes and gRPC by Natan Silnitsky Reacting to an Event-Driven World by Grace Jansen Cause of Death: Hibernate by Thorben Janssen NoSQL Endgame by Otavio Santana, Thodoris Bais, …

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Devoxx UA

Most conferences have been cancelled, since it is difficult to hold a conference these days. The idea to move the conference online has been obviously around, but it was rejected by most organizers, because it it not the same and the all important chance to meet other people is just not the same.  So the …

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How to rename files according to a pattern

We often encounter situations, where a large number of files should be copied or renamed or moved or something like that. This can be done on the Linux command line, but it should be possible in almost the same way on the Unix/Linux/Cygwin-command line of newer MS-Windows or MacOS-X. Now people routinely do that and …

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GIMP

In spite of working mostly for server software and server setup using powerful non-graphic command line tools and scripting languages, it is sometimes fun to work with something very graphical. I did talk about Clojure Art, which is fun and creates interesting visual results and helps getting into the phantastic language Clojure. But more than …

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How procurement can create value for IT projects

We know this, in many IT projects we need to make use of services and software and hardware that needs to be bought. Actually it often makes a huge difference, what kind of deals are made and how efficient the projects can work on this basis. I will just briefly tell a few stories and …

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How bad can a bad IT be for a company?

Just a funny story that happened some years ago… I wanted to buy some lamps in a stored somewhere 100 km away from where I lived. So I went to the shop, ordered them and bought something else already. Now I went there again when the lamps were there. I had ordered six lamps, but …

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