This is rather ugly solution out of conversation with MFTI students. Warm up for "Programming Kata".

Scene: cheap hardwire assempled into robot with 3 mics separated 10 cm each. On "Clap" robot is running towards clapper.

Simulation:

# Scene

c_speed_m = 340.29 # m / s
c_speed_cm= 34029 # cm/sec

# Grid size - area ...

I bought cheap bathroom fan to tackle common in Britain mold problem in a bathroom and it comes with analog humidistat, which you can adjust using screwdriver. My goal is to make sure my fan switches off on 50% humidity or lower.

I had a two Pinoccio boards and DHT22 ...

Not sure where I got this snipplet - most likely from reddit code or discussion.

from math import sqrt

def confidence_fixed(ups, downs):
    if ups == 0:
        return -downs
    n = ups + downs
    z = 1.64485 #1.0 = 85%, 1.6 = 95%
    phat = float(ups) / n
    return (phat+z*z/(2*n)-z ...

I was trying to follow this post, but github gists miss few variables, correct code shall be:

import pymc as mc
import numpy as np

N=20

#create some artificial data, like the data in the figure above.
lifetime = mc.rweibull( 2, 5, size = N )
birth = mc.runiform(0, 10 ...

Colleague of mine came with strange bug:

1. I am opening python shell, and sending request User.objects.all()

It returns valid information

* then i'm adding user via web site

* then i send request User.objects.all() again and new user is missing. If i will reopen shell then everything ...

Simple task like setting up monitoring with monit for rabbit mq include two parts:

1. As discussed here Modify /etc/init.d/rabbitmq-server

The following are added to the start
function:
    pid=`/usr/sbin/rabbitmqctl status | perl -n -e'/{pid,(\d+)/ && print $1'`
    echo $pid > /var/run/rabbitmq.pid
    Right before ...

Few days ago I realised that my django installation in production started producing too many memory errors - thanks to monit memory alerts were filling my mailbox without any serious service interruption. But hundreds email messages daily annoyed me enough to look deeper into trouble.

1) I switched on django debug ...

Recently, I decided to have a closer look at Riak non-sql database, but found out that unlike CouchDB riak doesn't have a HTTP basic auth implemented, or any other way of defining secure access to database.

I have three servers to build a cluster, but I feel very uneasy ...

Selecting python installed from mac ports on leopard works now like this:

sudo port select --set python python26

Took some time to figure it out as most of the hints on the web don't work

I found myself using more and more of this one-liner for working with couchdb database:

var getNewDatabusUUID = JSON.parse($.ajax({ type: "GET", url: "/_uuids/",                async: false }).responseText);  $.log("New uuid generated " + getNewDatabusUUID.uuids);

this example retrieves new uuids from couchdb, but I was using it to retrieve _rev of the ...

As I mentioned in my previous postI was using this tutorial as a basic for CRUD application for couchdb.

But I found that listing of "albums" is very slow. I modified code using for loop examples from the book "High Performance Javascript" and results of the JS tests from ...

If you wanted to make a select or checkbox element using mustache in couch db and trying to find example, here it is:

I am using couchdb so in shows, album-edit.js, I want a dropdown menu for group variable in couchdb.

var Mustache = require("vendor/couchapp/lib/mustache");  var ...

From stupid Data Mining Tricks: Overfitting S&P 500:

"Norman Bloom, no doubt a champion of all data miners, went beyond trying to predict the stock market. Instead, he used the stock market, along with baseball scores, particularly those involving the New York Yankees, to “read the mind of God ...

I put firefox 4 on my wifes mac mini, so I spent some time trying to get pingfire extension working with FF4.

Seems to be fine, drop me a comment or email and I may be will fix it :)

Install pingfire

From now on Western computers do not exists for me:

I bought iPad 32 Gb from them 24 February for my wife's birthday and within 4 days iPad became 100 pounds cheaper. Apple main store (online or retail)

provides refund of these 100 pounds for anyone who bought iPad ...

Recently I was asked the number of technical questions which I nearly failed to answer, not because I don't now the answer, but because I believe such questions require more information about the context. There is a common assumption about the default mind frame with MS windows and C ...

I am trying to speedup rather crappy php, website build on top of cakephp and decided to follow this tutorial, I was seriously annoyed that I can't get rig of /app/webroot prefix in css/js links. I didn't want to hack them directly because I am using ...

I just pushed xtreemfs cookbook to my git repo

This cookbook automates xtreemfs quick start for ubuntu 10.04.

I am using it with vagrant:

config.vm.define : xtreemfs do |xtreemfs_config|     xtreemfs_config.vm.box="base"    xtreemfs_config.vm.provisioner=:chef_solo    xtreemfs_config.vm.forward_port("ssh", 22, 2227,:auto => true)       xtreemfs_config.vm.forward_port ...

I found an interesting way of adding apt repository in hadoop cookbook:

execute "apt-get update" do  action :nothingendtemplate "/etc/apt/sources.list.d/cloudera.list" do  owner "root"  mode "0644"  source "cloudera.list.erb"  notifies :run, resources("execute[apt-get update]"), :immediatelyendexecute "curl -s http://archive.cloudera.com/debian/archive.key ...

Last week I went to the lecture on Evolutionary Algorithms and Multi Objective optimisation, which my friend [Dr Evan Hughes]("http://www.evanhughes.org" Dr Evan Hughes) taught as part of much larger course ("Sensors and Data fusion?"). It is very interesting course and I wish I had an opportunity ...