Welcome to hakank's Home Page

Home of http://www.hakank.org, Håkan Kjellerstrand (hakank@gmail.com)

Svensk version av denna sida.

hakank.blogg: my webblogg. Mostly in Swedish, but there are quite a few links which may be interesting even if you don't understand the text.
My Constraint Programming Blog: My blog about Constraint Programming and related paradigms.
Arrays in Flux: Blog about programming/programming languages, mathematics, machine learning/data mining, AI, etc.

My Linkedin page
My Twitter page. See below for the tweets.
My Google+ page My GitHub page
My GitHub repo: https://github.com/hakank/hakank/
My Rosetta Code page
My Google Scholar page
My DBLP page
My ResearchGate page
My about.me page (http://about.me/hakan.kjellerstrand)
CV and work related interests (English) here.
CV etc (in Swedish) here

My Erdös number is 5 (with papers on Constraint Programming and on Picat)

Note: Earlier I also had the email address hakank@bonetmail.com but it has been discontinued by the provider. Please use hakank@gmail.com instead.


  1. My Picat page Picat is a logic-based system with support for tabling, constraint programming and imperative structure features (loops, list comprehensions, destructive assignments etc)
  2. My Choco3 page Choco v3 is a Constraint Programming system in Java. It is not compatible with Choco v 2
  3. My B-Prolog page B-Prolog is a Prolog supporting CLP, tabling, foreach loops, arrays and list-comprehensions
  4. My Mathematica page Mathematica is a system for symbolic mathematics (and supports a lot of other math related things as well)
  5. My AIMMS+CP page AIMMS is a commercial Operations Research/Constraint Programming system
  6. Constraint-based constraint poetry constraint poetry (or "poetry") generated by Constraint Programming
  7. My AMPL page AMPL is a mathematical programming system with support for Constraint Proogramming. The models where written in Autumn 2007 and Spring 2008 and Spring 2013 (CP models)
  8. My Project Euler page Pointers to my implementations of some Project Euler problems
  9. My JSR-331 page JSR-331 is a Java specification for Constraint Programming API
  10. My Numberjack page Numberjack is a Constraint Programming system in Python
  11. My J page Programming language J
  12. My Frink page General programming language with converting between a huge number of different units as a feature
  13. My OscaR page Constraint Programming in Scala (former called Scampi)
  14. My PDDL page (planning, PDDL = "Planning Domain Definition Language")
  15. My SABR page (Constraint Programming, emphasis on spatial and temporal logic)
  16. My JaCop/Scala page (Constraint Programming)
  17. My APL page APL (programming language)
  18. My K/Kona page K (programming language)
  19. My Icon/Unicon page Unicon/Icon (programming language)
  20. My Perl 6 page Perl 6 (programming language)
  21. My Answer Set Programming page, Answer Set Programming is a declarative programmming paradigm
  22. My Google CP solver page Constraint Programming with implementations in Python, Java, and C#
  23. My Zinc page Constraint Programming
  24. My SETL/SetlX page programming language SETL and SetlX (programs in GNU SETL and SetlX)
  25. My JGAP page genetic programming, symbolic regression using the JGAP system
  26. My Eureqa/Formulize page equation discovery with genetic programming
  27. My SICStus Prolog page Constraint Programming
  28. My Pop-11/Poplog page Pop-11 is a great programming language, used for e.g. Artificial Intelligence.
  29. Data mining, machine learning etc
  30. Constraint Programming
  31. My MiniZinc page Constraint Programming
  32. My JaCoP page Constraint Programming in Java
  33. My Choco page Constraint Programming in Java
  34. My Gecode/R page Constraint Programming in Ruby and Gecode
  35. My Comet page Constraint Programming, also constraint-based local search and mixed integer programming
  36. My Gecode page Constraint Programming in C++
  37. My ECLiPSe page Constraint Programming, Prolog based system
  38. My Essence'/Tailor/Savile Row page Constraint Programming
  39. Common constraint problems a link collection of Constraint Programming problems that are implemented in at least two systems
  40. Simulation, probability theory etc
  41. My movies (not complete, but a start)
  42. Social Network Analysis and Complex Networks (in Swedish)
  43. Systemdynamik - System Dynamics (Swedish)
  44. The Literary Corner, my own fiction, poems etc (in Swedish)
  45. Comments and Notes
  46. MakeRegex Make a regex (regular expression) from a list of words. A Perl module and example. Also as a Java Applet.
  47. Other useless (and not so useless) programs (perhaps useful for recreational linguistics and recreational mathematics)
  48. Bookmarklets
  49. Some emacs elisp functions
  50. Taijiquan (Tai chi chuan)

Probably the only advertisment on my site:
bokus.com, the famous Swedish web book store, of which I once (as a consultant) was senior developer, programmer, sometimes project manager, and now my employer. Some of my early book purchases. (Links to bokus.)

And later in this sentence is a link to the site of Magnus Bodin: x42.com. He has done a lot of fun stuff.

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If you by any chance want to contact me, please feel free to mail me at hakank@gmail.com