Simulating the Golden Balls game show
In this eposide of Golden Balls, an inspired event takes place: I retold the event at DIKU APL lunch (nice to have a job where game theory is a valid conversation topic), and we had a conversation about it. At…
kostas
Simple programs for simple turing machines
I’ve always wanted to understand Turing Machines better. I believe that the best understanding comes from the intuition developed by solving puzzles. So here, I give myself some challenges. Solve simple problems by writing programs for a simple Turing Machine,…
Hooking into the whole Python way of distributing code
I’m just getting into this topic, but it seems that Python Eggs are the way to go. Here’s a good tutorial: In the long term, I’d like to be able to do: pip install
Three good StackOverflow answers on Python topics
Here are three thorough answers on Python topics from StackOverflow. Metaclasses Yield, iterables, iterators, generators Decorators
Apache Cassandra presentation slides
Apache Cassandra is a column-store with a p2p distribution architecture. Yesterday I did a presentation about Cassandra at Grontmij, Glostrup, Denmark. I made the slides in Google Docs, and they’re public: slides.
Creating visually random images
How complicated does a mathematical function, pseudorandom(x), have to be to create something that seems random, and how do you check whether it seems random? Looking at a long list of numbers is not a good way, because our ability…
How to remove extended attributes from a file edited with TextMate
If you run ‘ll -l’ sometimes a file has ‘@’ permission. This means that the file has extended attributes. TextMate may extended attributes to a file. Consider a fictional Python file called xxx.py edited with TextMate: View extended attributes: $…
Incrementing part of an array in numpy
given a (2D) array a, and a smaller (2D) array b, how can you add the smaller array to the bigger array at some offset in numpy? >>> a = zeros((4,4), dtype=int) >>> a array([[0, 0, 0, 0], [0, 0,…
Hello world of raster creation with GDAL and Python
Mostly so I myself can remember how to do it, here is how to create a random geotiff with GDAL in Python Note: the width and height are given in opposite order in the GDAL raster and numpy arrays! import…
Using Cython, psyco and other tricks to make Python run faster
This is a good post showing how “perrygeo” uses Cython to speed up a pure Python function. The comments also discuss alternatives and options: Using psyco instead of Cython Using optimization flags for gcc Using xxx instead of math.xxx