Yesterday I was trying to find a bug in my source code which lead to quite unexpected results. I thought that I narrowed down the possible origin and will be able to localize the problem within a short time. However,…
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Blog Archives
Debugging in the sleep
Tagged with: dream, programming, sleeping, Software bugs, solution
Posted in computer, GPS, math, physics, programming
Posted in computer, GPS, math, physics, programming
Standard deviation of a standard deviation
The title of this post is maybe not correct in a mathematical sense, but I was asking myself if there exists an estimator for the “standard deviation of a standard deviation” or a kind of error bound for a sample…
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Tagged with: Data analysis, Errors and residuals in statistics, Estimator, mathematician, Normal distribution, Sample size determination, scientist, Standard deviation, Statistics, Uncertainty
Posted in math, paper, physics, programming
Posted in math, paper, physics, programming
SVN revision number in c++ code – an impossible task ?
Subversion (or just SVN) is a software versioning and revision control system which has been used for countless projects since its release in 2000. Also the software project to which I contribute is managed and distributed via SVN. Yesterday, I…
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Tagged with: C, Computer programming, Revision control, Software, software versioning, Subversion
Posted in computer, programming
Posted in computer, programming
The shallow water equations in Octave
Playing with partial differential equations can be great fun. I guess the shallow water equations are one of the most easiest to understand system, which have a clearly visible impact in daily life. It does not matter if you have…
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Random walk and the central limit theorem
Random walk is the mathematical formalization of a path which consists of a succession of random steps. In the simplest (one-dimensional) case, the particle (or object of interest) propagates by a certain distance which is obtained from a random generator.…
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Tagged with: Central limit theorem, Normal distribution, Probability distribution, Random walk, simulation, Standard deviation, Statistical inference, Statistics, Stochastic processes
Posted in math, physics, programming
Posted in math, physics, programming
How to turn an ASCII table with AWK
Imagine you have a text (ASCII) file that holds a table/matrix, e.g. A1 A2 A3 A4 A5 B1 B2 B3 B4 B5 C1 C2 C3 C4 C5 but what you need, is the information transposed, i.e. A1 B1 C1 A2…
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Fedora 18 and CUDA
After giving up installing (and running) CUDA under F17, I gave it a try with the latest version, i.e. Fedora 18. As usual I selected the 64-bit version and it turned out that CUDA become usable under this OS again.…
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My scientific year 2012 – a review
First of all, I wish all my readers a Happy New Year. After taking off the last two weeks and returning to Austria for Christmas holidays I am back in the office today. Before really starting in 2013 it is…
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Tagged with: Academia, Papers, Peer review, Publishing, Thomson Reuters
Posted in paper, programming
Posted in paper, programming
The flying PC cluster
Modern in-flight entertainment systems play video-on-demand, provide you with information about your flight or just let you listen to some music. It is interesting to read that most of these systems rely on Linux (or similar OS like Android) in…
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Tagged with: Android, In-flight entertainment, in-flight entertainment systems, Linux, Multi-core processor, Qatar Airways
Posted in computer, physics, programming, travel
Posted in computer, physics, programming, travel
35 years of AWK
AWK is a kind of programming language that allows you to extract or manipulate ASCII data from the command line. AWK was created at Bell Labs in 1977, and its name is derived from the family names of its authors…
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Tagged with: AWK, LaTeX, Linux, Scripting languages, Software, Unix
Posted in computer, math, physics, programming
Posted in computer, math, physics, programming
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