Category Archives: Programming

Wikipedia Images

Posted on June 21, 2011 by lorg

A few days ago a friend (x) of a friend (y) showed me and my friend (y) a small app he was developing, that had photos from flickr and picasa. We suggested adding photos from Wikipedia as well, but he … Continue reading →

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Posted in Programming | Tagged , , , | 2 Comments

Small programming challenge No. 6 – nblocks

Posted on January 25, 2011 by lorg

I came up with this challenge when I had to write a function to divide a sequence to percentiles. I needed this to calculate some statistics over trips for plnnr.com. “This sounds trivial” I thought, and reached for my simple … Continue reading →

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Posted in Challenges, Programming, Python, Statistics | Tagged , , , , | 21 Comments

Visualizing Data Using the Hilbert Curve

Posted on April 17, 2010 by lorg

Some time ago, a coworker asked me to help him visualize some data. He had a very long series (many millions) of data points, and he thought that plotting a pixel for each one would visualize it well, so he … Continue reading →

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Posted in Fractals, Graphics, Math, Programming, Python | Tagged , , , | 2 Comments

Open Redirects

Posted on March 26, 2010 by lorg

In this post I’ll discuss an issue I tackled a short while ago – open redirects. But first, the story of how I got to it. Feel free to skip ahead to the technical discussion. Background Our analytics for plnnr.com … Continue reading →

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Posted in Programming, Security, web-design | Tagged , , , , , , , | Leave a comment

Pyweb-il Presentation on Optimization Slides

Posted on March 26, 2010 by lorg

Last Monday I gave a presentation in pywebil on optimization, that’s loosely based on my blog post on the same subject. Here are the slides for that presentation.

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Posted in Optimization, Programming, Python | Tagged , , , | Leave a comment

Javascript Element Creator

Posted on March 17, 2010 by lorg

Some time ago I was working on optimizing the client side code of my website, plnnr.com, an online trip planner. This website does automatic trip planning, and the problem was that recalculating trips was slow. After profiling, I found out … Continue reading →

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Posted in Javascript, Optimization, Programming, Projects, startup, web-design | Tagged , , , | 2 Comments

Ethics in Programming

Posted on March 8, 2010 by lorg

Some time ago I was bothered by the issue of ethics in programming. I heard the question best raised during a “game unconference” I attended. There was a panel about monetary systems for games, and people talked about the issues … Continue reading →

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Posted in Programming, Programming Philosophy | Tagged , | 7 Comments

Simple SQLObject DB Migration how-to

Posted on March 3, 2010 by lorg

I’ve been using sqlobject for plnnr.com for quite some time now. So far my experience with it has been positive. Although I’ll probably change ORM when I move to django, for now it stays. While it stays, I need to … Continue reading →

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The mathematics behind the solution for Challenge No. 5

Posted on February 26, 2010 by lorg

If you take a look at the various solutions people proposed for the last challenge of generating a specific permutation, you’ll see that they are very similar. Most of them are based on some form of div-mod usage. The reason … Continue reading →

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Posted in Challenges, computer science, Programming, Python | Tagged , , , , | Leave a comment

Small Programming Challenge no. 5 – Generating a Permutation

Posted on November 11, 2009 by lorg

I thought of this one quite a long time ago, and I believe that the idea behind it is pretty nice mathematically. I got the idea for it from Knuth’s “The Art of Computer Programming”. The challenge is simple: write … Continue reading →

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Posted in Challenges, computer science, Programming | Tagged , | 15 Comments