http://www.bibsonomy.org/rss/user/jaeschke/programmingBibSonomy RSS Feed for /user/jaeschke/programminghttp://jibbering.com/faq/notes/closures/jaeschke2012-01-31T18:29:45+01:00closures html javascript programming web Often when working on microcontroller projects you need a background function to run at regular intervals. This is often done by setting up a hardware timer tohttp://www.uchobby.com/index.php/2007/11/24/arduino-interrupts/jaeschke2011-12-01T07:14:34+01:00arduino hardware interrupt programming Often when working on microcontroller projects you need a background function to run at regular intervals. This is often done by setting up a hardware time<span class="info">...<div>Often when working on microcontroller projects you need a background function to run at regular intervals. This is often done by setting up a hardware timer to</div></span>http://xor0110.wordpress.com/2010/06/04/making-the-change-with-prolog-the-bad-the-ugly-and-the-good/jaeschke2011-11-13T18:07:03+01:00ai problem programming prolog solving http://blog.sigfpe.com/2006/08/you-could-have-invented-monads-and.htmljaeschke2011-11-03T08:47:56+01:00category haskell infinity monad programming theory http://stackoverflow.com/questions/1726632/dynamic-programming-largest-square-blockjaeschke2011-10-06T09:48:31+02:00algorithm empty large programming square http://www.davidbdean.com/2006/08/17/how-to-plot-a-2d-histogram-using-matlab/jaeschke2011-08-11T11:54:05+02:00density histogram math matlab plot programming To make a density map from a 2D set of data, the first step is to compute values for the third dimension. (Gnuplot has no facilities for computing these values automatically.) The simplest way is to make a 2D histogram; the plot is divided in small 2D regions, and the z-values are proportional to the number of points inside these regions. The following Python script will make an histogram from a time series of two dihedral angles. http://pelican.rsvs.ulaval.ca/mediawiki/index.php/Making_density_maps_using_Gnuplotjaeschke2011-08-11T11:22:47+02:00density gnuplot histogram math plot programming To make a density map from a 2D set of data, the first step is to compute values for the third dimension. (Gnuplot has no facilities for computing these va<span class="info">...<div>To make a density map from a 2D set of data, the first step is to compute values for the third dimension. (Gnuplot has no facilities for computing these values automatically.) The simplest way is to make a 2D histogram; the plot is divided in small 2D regions, and the z-values are proportional to the number of points inside these regions. The following Python script will make an histogram from a time series of two dihedral angles. </div></span>http://code.google.com/p/openid-selector/jaeschke2011-07-15T16:29:21+02:00html javascript library openid programming web http://thedailywtf.com/Articles/Disgruntled-Bomb-Java-Edition.aspxjaeschke2011-05-25T08:42:02+02:00fun java programming http://www.artechra.com/media/speaking/2010/OOP2010-Top10Mistakes.pdfjaeschke2011-05-09T12:11:24+02:00architecture mistake programming software http://www.java-forum.org/misc.php?do=linkbacksjaeschke2010-11-20T19:11:25+01:00pingback programming refback trackback web Last week, Diaspora — the OSS privacy-respecting social network — released a “pre-alpha developer preview” of their source code. I took a look out it, mostly out of curiosity, and was struck by numerous severe security errors. I then spent the next day digging through their code locally and trying to get in touch with the team to address them, privately. In the course of this, I mentioned obliquely that the errors existed on Hacker News, and subsequently was interviewed by The Register and got quoted in a couple of hundred places.http://www.kalzumeus.com/2010/09/22/security-lessons-learned-from-the-diaspora-launch/jaeschke2010-09-24T08:41:53+02:00programming ruby security toread Last week, Diaspora — the OSS privacy-respecting social network — released a “pre-alpha developer preview” of their source code. I took a look out it, mos<span class="info">...<div>Last week, Diaspora — the OSS privacy-respecting social network — released a “pre-alpha developer preview” of their source code. I took a look out it, mostly out of curiosity, and was struck by numerous severe security errors. I then spent the next day digging through their code locally and trying to get in touch with the team to address them, privately. In the course of this, I mentioned obliquely that the errors existed on Hacker News, and subsequently was interviewed by The Register and got quoted in a couple of hundred places.</div></span>http://stackoverflow.com/questions/184618/what-is-the-best-comment-in-source-code-you-have-ever-encountered/482129#482129jaeschke2010-09-16T19:46:27+02:00code comment development fun funny joke programming source toread Elementare Einführung in PostScript als Programmiersprache, Demonstrationsbeispiele aus dem Bereich der Farbenlehre u.a.http://www.itp.uni-hannover.de/~zawischa/ITP/proPS.html#umlaukjaeschke2010-07-24T21:03:52+02:00graphics postscript programming Elementare Einführung in PostScript als Programmiersprache, Demonstrationsbeispiele aus dem Bereich der Farbenlehre u.a.JSON.simple is a simple Java toolkit for JSON. You can use JSON.simple to encode or decode JSON text. http://code.google.com/p/json-simple/jaeschke2010-07-20T11:28:26+02:00java javascript json programming simple web JSON.simple is a simple Java toolkit for JSON. You can use JSON.simple to encode or decode JSON text.Or: everything you never wanted to know about arctangent implementations and weren&#039;t afraid to not ask. http://www.coranac.com/documents/arctangent/jaeschke2010-06-25T14:34:25+02:00arctan atan integer programming trigonometry Or: everything you never wanted to know about arctangent implementations and weren&#039;t afraid to not ask.This routine will take an 8 bit integer that corresponds to the numerator of a fraction whose denominator is 256 and find its arctangent. So the input ranges from 0 to 255 which corresponds to 0 to 255/256 = 0.996 . The output for an arctangent routine that returns a floating point number would be from 0 (atan(0)) to 0.783 (atan(255/256)) radians; or if you prefer, 0 to 44.89 degrees. However, this routine scales the output so that pi/4 radians (or 45 degrees) corresponds to 256. So for the input range of 0 to 255 you get an output of 0 to 255 ( atan(255/256) * 256 / (pi/4) is about 255). It&#039;s probably a little more interesting to see an intermediate data point or two: http://www.piclist.com/techref/microchip/atan.htmjaeschke2010-06-25T14:30:42+02:00arctan atan integer pic programming trigonometry This routine will take an 8 bit integer that corresponds to the numerator of a fraction whose denominator is 256 and find its arctangent. So the input rang<span class="info">...<div>This routine will take an 8 bit integer that corresponds to the numerator of a fraction whose denominator is 256 and find its arctangent. So the input ranges from 0 to 255 which corresponds to 0 to 255/256 = 0.996 . The output for an arctangent routine that returns a floating point number would be from 0 (atan(0)) to 0.783 (atan(255/256)) radians; or if you prefer, 0 to 44.89 degrees. However, this routine scales the output so that pi/4 radians (or 45 degrees) corresponds to 256. So for the input range of 0 to 255 you get an output of 0 to 255 ( atan(255/256) * 256 / (pi/4) is about 255). It&#039;s probably a little more interesting to see an intermediate data point or two: </div></span>I needed a quick arctangent function using integer arithmetic, so I could convert (Δx, Δy) target locations to turn angles.http://forums.parallax.com/forums/default.aspx?f=25&amp;m=451108jaeschke2010-06-25T14:25:03+02:00arctan atan integer programming trigonometry I needed a quick arctangent function using integer arithmetic, so I could convert (Δx, Δy) target locations to turn angles.by polynomial approximationhttp://www.convict.lu/Jeunes/Math/arctan.htmjaeschke2010-06-25T14:24:22+02:00arctan atan integer programming trigonometry by polynomial approximationhttp://www.mhaller.de/archives/29-Obfuscating-and-reducing-JavaScript-using-Trinidad-plugin.htmljaeschke2010-05-28T18:06:26+02:00javascript maven plugin programming web