In order to dive into the world of povray, I chose the above experimental setup which is actually used for measuring the Raman shift. Google quickly came up with a reference source. However, the source is neither documented, nor explained. Hence, I’m trying to give a short introduction for newbies […]
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In case anybody is interested in the (very entertaining) lecture `Advanced Statistical Mechanics’ by Jens Eisert, here is a short summary of the content. In fact, this is part of my exam preparation 😉 I omitted most of the introduction on basic quantum mechanics, as this knowledge is required for […]
Unfortunately, my Acer Iconia A 510 was bricked some 20 hours after I got it back from repairing. Once again, the display had issues: now the screen is completely dark. Completely? No, just the backlight has ceased to work. As cyberport Berlin was unwilling (they prefer to call it `unable’ […]
Adding the values from two lists in a pairwise fashion is a rather common programming issue in the daily data processing routine. As python is not known to be the very best basis for high throughput calculations, one should know python’s limits. Starting from the following script, #!/usr/bin/env python l1 […]
By default, the TabbedPanel uses a GridLayout with the restriction of one row and 99 columns for the headers. This should be sufficient for most applications. However, it is more common to add a second row for the tabbed headers instead of trying to fit them all into one single […]
After installing kivy, I got a wonderful detailed error message: [WARNING] [WinPygame ] Video: failed (multisamples=2) [WARNING] [WinPygame ] trying without antialiasing [ERROR ] [Window ] Unable to use <pygame> as windowprovider [ERROR ] [Window ] The module raised an important error: 'X11 driver not configured with OpenGL' It is […]
Have you ever wondered when the fireworks actually start and how long people remain busy? Yes, everybody is making fun of those who cannot wait until midnight. But most of the people are getting it right: Or the more interesting part: My notebook has pulled an all-nighter to record the […]
Once again, portage is unhappy and complains about this command tunix calibre # g++ -O2 -march=native -pipe -fPIC -O2 -march=native -pipe -pthread -I/usr/include/python2.7 -I/usr/include -I/usr/include/podofo -c /var/tmp/portage/app-text/calibre-0.9.6/work/calibre/src/calibre/utils/podofo/output.cpp -o /var/tmp/portage/app-text/calibre-0.9.6/work/calibre/build/objects/podofo/output.o In file included from /usr/include/podofo/podofo-base.h:27:0, from /usr/include/podofo/podofo.h:34, from /var/tmp/portage/app-text/calibre-0.9.6/work/calibre/src/calibre/utils/podofo/global.h:14, from /var/tmp/portage/app-text/calibre-0.9.6/work/calibre/src/calibre/utils/podofo/output.cpp:8: /usr/include/podofo/base/PdfDefines.h:66:28: fatal error: boost/config.hpp: No such file or directory compilation […]
During the installation of calibre, I got this error: * Building of dev-python/cssselect-0.7.1 with CPython 3.2... python3.2 setup.py build -b build-3.2 running build running build_py creating build-3.2 creating build-3.2/lib creating build-3.2/lib/cssselect copying cssselect/parser.py -> build-3.2/lib/cssselect copying cssselect/xpath.py -> build-3.2/lib/cssselect copying cssselect/tests.py -> build-3.2/lib/cssselect copying cssselect/__init__.py -> build-3.2/lib/cssselect warning: build_py: byte-compiling […]
Retrieving information on the possible frame rates for a given pixel format (RGB, YUYV, …) and a given frame size (640*480, …) using v4l2 should be simple. However, it took me some time to find the appropriate section in the documentation. In case you already have a file descriptor fd […]
It was quite surprising to me, that before you can require a virtual machine to use a local partition, you have to create a new virtual machine with a local disk file. Let’s assume that you have created a virtual machine. Now Right click on the virtual machine list entry […]
A few days ago, I asked myself whether pop music is getting faster over time. In order to check this, I looked for the music tempo in beats per minute (BPM) for most of the billboard top ten since 1970 and calculated the average BPM over time. As you can […]