Another pyblosxom blog

bigdog is obsolete?

2010-01-04T22:51:21Z

things I've learned: need two motors per four leggs, not one, need stronger joints. and I probbably don't need expensive motor speed controllers I bought. gallery has been and will be updated periodically. http://www.youtube.com/watch?v=MbPDbVqqAIM how does it turn/why am I holding it with a piece of wood? this is just left part of the body.

klann walker!

2010-01-04T20:58:40Z

I'm working on 8 legged, large spider-like robot (1.5x1.5 meters, about 50kilos) Starting with a wooden prototype as opposed to computer simulations/cad drawings, in order to save time. gallery, will be updated as I progress. and a short video http://www.youtube.com/watch?v=DAWtSfaqgIA this leg design is called "klann linkage" just a prototype of a prototype, still walking kinda crappy.

rorschach generator

2009-12-05T04:00:49Z

after looking at the rorschach test, I wanted more. supirisingly, I couldn't find any rorschach generators online, so, python, tkinter and randomwalk with random size blobs and simmetrical reflection, I thought that some tweaking or more complicated algorithm would be needed but this works great. click on a canvas for (re)generation. examples and source.

automatic generation of desktop backgrounds.

2009-12-02T17:59:30Z

while looking at context free art I was thinking wow those pictures are very nice and I want them on my desktop and on my walls and all over my body. (its a context free language used to describe recursive patterns whose execution is then represented by images. images that tend to look natural and lifelike because lifelike things tend to describe themselves in similar ways.) when talking about things in this language, its all about probabilities and not about fixed values, so every time a picture is generated from the same description, it looks different! SO: hourly wallpaper generation. here is my /etc/cron.hourly/wallpaper.sh:

#!/bin/bash

/usr/bin/cfdg -w 1680 -h 1050 /etc/wallpaper/symchasm.cfdg /tmp/b.png && /usr/bin/display -window root /tmp/b.png
logger "new wallpaper generated."

I have tiling wm so this is useless for me. but, just a thought.

evolving prisoner's dilemma solution

2009-12-01T17:59:30Z

bunch of selfish prisoners having sex and mutating. WHOA. very basic evolutionary algorithm, a last night's play. a problem: Will the two prisoners cooperate to minimize total loss of liberty, or will one of them, trusting the other to cooperate, betray him so as to go free? In the iterated prisoner's dilemma the game is played repeatedly. Thus each player has an opportunity to "punish" the other player for previous non-cooperative play. Cooperation may then arise as an equilibrium outcome. solutions: I didn't get tit for tat which I originaly expected, nor did I manage to get a cooperative equilibrium. cooperation does evolve, but it doesn't last, strange, I expected that cooperative species will raise and stay dominant as I enlarge the number of interactions before a step in the evolution. (its rational to be nice if you need to stick around) need to think about this some more. I'll post more info and code later or never. screenshot and someone with a different approach and a spacial dimension.