July 2010
16 posts
“A market for lemons is a market where the sellers cannot evaluate beforehand the...”
– Mechanical Turk, Low Wages, and the Market for Lemons - A Computer Scientist in a Business School
“When will our politicians finally deal with the looming Amish menace? Last week,...”
– Amish Kid Leads Police on One-Mile Horse and Buggy Chase
1 tag
Card Puzzle, Now in GAMS
Code below the line. Every new model I code in GAMS gives me the task to express things I took for granted elsewhere in a different, slightly awkward way. This time, it is index arithmetic. Every programming language I know allows calculations on the index(s) of an array, and I don’t see why an algebraic modeling language would not provide me with that on integer indexed sets as all the...
This mornings WTF moment...
I write like Cory Doctorow
I Write Like by Mémoires, Mac journal software. Analyze your writing!
The Oracle of Bacon →
1 tag
An OPL model solving an 18th century card puzzle
… Incidentally, you may get a kick out of solving this eighteenth century card puzzle: Arrange all the jacks, queens, kings, and aces from a deck of cards in a square so that no suit or value would appear twice in any row, column, or the two main diagonals.
from http://www.hakank.org/constraint_programming_blog/minizinc/
/********************************************* * OPL 6.3 Model *...
Open Solver for Excel
OpenSolver
For those of us who are frustrated by the 200-variables limit of Excel’s solver, there is a good open source alternative out there. It may not be as fast as Gurobi or Cplex, but then Excel models should not require you to use that heavy artillery anyway.
“You know your movie is in trouble when Sean Connery in a wedding dress is the...”
– I-Mockery.com | The Best And Worst Of Zardoz!
“Die Ergebnisse weisen darauf hin, dass gewalthaltige Computerspiele Depressionen...”
– Studie: Killerspiele killen Stress und Depressionen - Golem.de
“Malaysia, 1943. Our regiment was hopelessly outnumbered and faced certain death....”
– Magnum, P.I. Quotes | BookRags.com
“Forecast accuracy is ultimately limited by the nature of the behavior we are...”
– Focus on Forecasting: Worst Practices in Business Forecasting 