View trie.py
#!/usr/bin/env python
"""
A ternary search tree implementation, inspired by:
http://www.drdobbs.com/database/ternary-search-trees/184410528 and
https://lukaszwrobel.pl/blog/ternary-search-tree/
https://github.com/djtrack16/tst/blob/master/ternarysearchtree.py
"""
View binary_search_tree.py
#!/usr/bin/env python
"""
A binary search tree implementation, from:
"Python Algorithms: Mastering Basic Algorithms in the Python Language"
by Magnus Lie Hetland
ISBN: 9781484200551
View reflexes.c
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/time.h>
#include <pthread.h>
void *listen(void *timestamp) {
int c;
while((c = getc(stdin)) != EOF) {
if( c == '\n' ) {
View reflexes.go
package main
import (
"bufio"
"fmt"
"math/rand"
"os"
"time"
)
View MatrixDSL.scala
/* This is a scala solution for a mini domain specific language (DSL)
* defining instructions for populating an empty matrix.
*
* Input consists of a single string separated by spaces:
* - the first number represents the size of the matrix, NxN
* - the rest of the input consists of one or more strings defining
* the range of cells and how each of their populations will be
* incremented
*
* Increment pattern possibilities:
View SchemaSpy-HOWTO.md

SchemaSpy is a neat tool to produce visual diagrams for most relational databases.

Here's how to use it to generate schema relationship diagrams for PostgreSQL databases:

  1. Download the jar file from here (the current version is schemaSpy_5.0.0.jar)

  2. Get the PostgreSQL JDBC driver (either the JDBC3 or JDBC4 jar file is fine)

  3. Run the command against an existing database. For most databases, the schema (-s option) we are interested in is the public one:

View debian-install.sh
apt-get install -y build-essential \
# development \
git mercurial roxterm curl gawk \
libpcre3-dev libssl-dev \
qt4-dev-tools libqt4-dev libqt4-core libqt4-gui libqt4-opengl libqt4-network \
libssl-dev libdb5.1++-dev libboost-all-dev libqrencode-dev libminiupnpc-dev \
python-all-dev python-lxml python-magic python-imaging python-pip python-pandas \
erlang \
# word processing \
texlive-latex-base latex2rtf texlive-full \
View RaspberryPi_A_Plus_Wifi.md

Rationale

The Raspberry Pi Model A+ has just a single usb port, so getting the wifi configured has to done by editing /etc/network/interfaces from a command line prompt.

These instructions assume the Raspbian OS on the SD card, and a usb wifi adapter that supports the RTL8192cu chipset, since the current Raspbian has built-in support for it.

Before the first boot

  1. Put a keyboard in the usb slot
  2. Connect the HDMI slot to a monitor
View ComodoSSL_HOWTO.md

Create the Certificate Signing Request (CSR) file

openssl req -nodes -newkey rsa:4096 -keyout example_com.key -out example_com.csr

Prepare the Bundle file

Unzip the file Comodo sends back and create a single certificate bundle file.

View dst.py
from datetime import datetime
import pytz
def is_dst ():
"""Determine whether or not Daylight Savings Time (DST)
is currently in effect"""
x = datetime(datetime.now().year, 1, 1, 0, 0, 0, tzinfo=pytz.timezone('US/Eastern')) # Jan 1 of this year
y = datetime.now(pytz.timezone('US/Eastern'))