This post will be a little bit longer as the usual ones, as it deals with some thoughts which I had when playing with GPS orbits. Assuming that you want to estimate the position by means of GPS it is…
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Blog Archives
GPS satellites in view – the more the better?
Karhunen-Loève Transform – an interesting alternative to FFT and wavelets
Today I stumbled over this interesting paper which describes the usage of the Karhunen-Loève Transform (KLT) for (weak) signal detection in time-series. Although there are many similarities with wavelet analysis, the KLT seems to be less computationally demanding (but its…
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GMT 5 is coming
The Generic Mapping Tools (GMT) are a convenient software package for displaying data on a large variety of map projections. Until now data could be converted into GMT native (i.e. NetCDF) format and then output to postscript. With the announcement…
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Programming AMD GPUs
I am now writing code for NVIDIA GPUs based on CUDA for almost three years. Every two or three months I am thinking to purchase an ATI card and compare its performance to one of the latest NVIDIA cards (e.g.…
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The world in 200 countries over 200 years using 120,000 numbers – in just four minutes
Posted in math
Optical illusions
Here’s a great page which contains a lot of optical illusions which twist your brain. You will be amazed how much movement you see in static pictures
Posted in math
IQ world map
Yesterday I found this map on a blog which I thought might be interesting to discuss here. it shows the average (?) IQ for each country, colour-coded as a map. As there is no reference for this data I continued…
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Mandelbrot extreme
Maybe you have stumbled over Mandelbrot plots or animations before, but this one here is one of the best I have ever seen. It was created with open source software. Update: Here’s another amazing one:
Five trillion digits of Pi – on a single PC
A Japanese engineer and an American student set a new world record of computing the digits of Pi. Using a single PC, they ran the computations over 90 days, getting down to the five trillionths digits, which by the way…
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