, 5 min read
1. Problem statement Compiling source code with a compiler usually employs the make command which keeps track of dependencies. Additionally GNU make can parallelize your build using the j-parameter. Often you also want a so called clean build, i.e., compile all source code files, just in case make…
, 1 min read
This blog was viewed more than 20.000 times. As in this post, here are the numbers: The averages per day are: The development of visits is as below: Top posts (all time) are: Most visits come from US and Germany by a wide margin:
, 1 min read
The new editor in WordPress.com is quite annoying. It is annoying because: list of categories do not show up edit area is smaller "copy a post" is missing "format" menu is now a drop-down Unfortunately there is no option to switch back and forth between the annoying and the…
, 1 min read
I have four free invites to purchase a OnePlus One smartphone. Below are the codes: GLU4-W66Y-VALB-PEPS GLZK-QIZH-3GAL-QQYQ GLQ5-74SJ-EDCA-GH1K GLRW-XU8U-8MSB-GQ28 They expire within one day.
, 1 min read
Two more invites: GL05-1RXC-BCFK-C3VN GLCF-1RUJ-ODEW-1YZW These are now expired.
, 1 min read
I have again two free invites to purchase a OnePlus One smartphone. Below are the codes: GLFB-GQM2-ZDHX-2XJM GLQW-0J5G-URN3-ZPIC The last two invites were just claimed, and were not actually used. This is really a waste of these invites, as there are a lot of people who really would like to…
, 2 min read
Yet another excellent speech from Malcolm Gladwell given at High Point University, see highpoint.edu. This time on Financial crisis of 2007–08 Battle of Chancellorsville between General Lee and Joe Hooker during the American Civil War in 1863 Overconfidence and miscalibration, results from…
, 1 min read
A very interesting speech of Malcolm Gladwell on stubbornness in below YouTube video. Dead link. Video is here: Conference: Genius in 2012 He makes references to Linear B, i.e., historic greek symbols Michael Ventris, deciphering Linear B Andrew Wiles and his proof for Fermat's Last Theorem, no…
, 3 min read
Importing calendar data to Google is still troublesome for a number of reasons. What seems to work goes like this: Force-stop calendar app in your Android phone Clear all calendar data in your Android phone Shut down your Android phone Log-off from all other Google accounts Shut down your browser…
, 1 min read
I have two free invites for the OnePlus One. Below are the links: GLYP-ATVO-YQ8K-D969 GLGQ-A0LM-I7RL-EKGB Please do not click on the links if you do not want to actually buy the phone, because the invites are then reserved and cannot be used by others. For a review of the phone see Review of the…
, 7 min read
Abstract. This article will give a very simple definition of $k$-forms or differential forms. It just requires basic knowledge about matrices and determinants. Furthermore a very simple proof will be given for the proposition that the double outer differentiation of $k$-forms vanishes. MSC 2010:…
, 1 min read
For testing purposes you may want to provoke a file-size error. Here are the steps. Open a new bash/xterm. Set a file-size limit with ulimit, then write a file with dd. ulimit -f 1 dd bs=1 iflag=count_bytes count=5000 if=/dev/zero of=yourFile The resulting error is File size limit exceeded (core…
, 1 min read
Below chart is taken from Stress That Doesn't Pay: The Commuting Paradox, August 2004, page 30. The data is per 2000/2001. The above document links these numbers with reported satisfaction with life -- longer commuting times means less happiness. Numbers change over time. Five year later the U.S.…
, 1 min read
On Ubuntu install with: apt-get install gnupg First generate private and public key: gpg --gen-key Generating this key can take some time, because it needs enough randomness. Store your public key in a file: gpg -a --export Although it is not necessary to store this public key, you usually will…
, 1 min read
Im(Press)ive! Your Year in Review published some usage statistics for the year 2014, which are quite astonishing: 18,300,771 new blogs 555,782,547 new posts 24.5 TB/h (Terabyte per hour) Compare this with statistics from year 2013: 13,704,819 new blogs 489,281,136 new posts 667,675,929…
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Downloading the Boost C++ library is occasionally hindered by various company policies. boost_1_57_0.7z.rc4.b64 is Boost version 1.57.0 (MD5 is 17c98dd78d6180f553fbefe5a0f57d12) in the following format: compressed with 7z, size 55 MB encrypted with RC4, password "boost", size doesn't…
, 1 min read
The conference will start in September 6-9, 2015, Krakow, Poland. Parallel Programming and Applied Mathematics, PPAM for short, is a biennial conference started in 1994, with the proceedings published by Springer in the Lecture Notes in Computer Sciences series, see PPAM (dead link). It is…
, 1 min read
Below are two invites for the OnePlus One smartphone. These two invites expire in less than 12 hours. Don't click on the invites if you don't want to actually purchase the…
, 4 min read
SLURM is a job-scheduler for Linux. It is most useful if you have a cluster of computers. But if you only have two or three computers it can be put to good use. SLURM is an acronym for Simple Linux Utility for Resource Management. SLURM is used by Sunway TaihuLight with 10,649,600 computing cores,…
, 4 min read
I have been a loyal user of del.icio.us since 2006. I have written on this in my post Saving URLs in del.icio.us Still Troublesome. But now enough is enough. Here is a list of annoyances: You can neither export nor import your data anymore. The service is generally slow, i.e., it takes a lot of…