When reading and trying to understand some very old Fortran code I stumbled over an interesting solution to store character expressions in a time when PCs were only designed to deal with numeric types. If someone wanted to store the…
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Blog Archives
Hollerith constants
Posted in computer, programming
Central limit theorem
Today I had to recall some basic theorem which I learnt in one of the introduction courses on statistics at university – the “central limit theorem“. The central limit theorem states that, given certain conditions, … the mean of a…
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Shake your plant
There is a lot of research going on in human-machine interaction, and there are really nice examples that show how the gap between a person and a computer can be bridged, letting them “talk” almost intuitively. However, researchers from Keio…
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Additive noise
Whenever you measure something you usually repeat these measurements, in order to determine not only the quantity you are looking for but also access its uncertainty. Given that you have measured different quantities and derive a new one from a…
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Posted in math, programming
Two-line elements of current GLONASS satellites
The Celestrak page provides a variety of two-line elements (TLE) for different satellites, including orbit information for navigation satellite systems like the Russian GLONASS. Unfortunately, there are more satellites listed in the TLE data-set than are currently operational. E.g. today…
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The “broken link checker” for WordPress
Yesterday I added a very useful plug-in for this WordPress installation – the broken link checker. Once it is installed it searches all links in posts, pages, etc. and checks if they are still valid. By this nice little tool…
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Posted in computer, programming
Fedora 16 and CUDA
Until Fedora 15 I somehow managed to get the NVIDIA driver and the CUDA compiler running, but Fedora 16 seems to quite of a hurdle. I tried something similar as for F15, including a patch which solves the Kernel version…
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Merging my homepage and this blog
For long time I was keeping my homepage up-do-date and I have been posting on this blog. More than half a year ago I ported my homepage to Drupal and thought that things become more easy, but it turned out…
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Posted in computer, programming
Formal errors of bilinear interpolation
The bilinear interpolation is a quite useful mathematical approach when it comes to interpolation in a two- or higher-dimensional regular grid. Other than a nearest neighbour approach or simple block averaging, this method provides a somewhat “continuous” field. Thereby, one…
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The impact of constraints on linear least-squares problems
OK, this post is going to be a little bit longer than the usual article which I am writing here. First, I was thinking to summarize my thoughts in a short note, but why not post it here directly? So…
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Posted in math, programming
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