Category: Script Library

Rijndael / AES (128 bit) in VB.net, PHP, Python

Being able to transport encrypted data is important in some of my projects at work. One-way hashes using MD5 usually suffice for most encryption purposes but Symmetric Encryption algorithms are important for encrypting and then decrypting data. For this, we use the Rijndael and AES algorithm in a few different languages.

November 21, 2012
Removing the BuddyPress Admin Bar

A short script to remove that pesky BuddyPress Admin Bar in Wordpress 3.4.2 and BuddyPress 1.6.1

October 26, 2012
Cosine Similarity in MS SQL

Cosine similarity measures the angle between two vectors and can be used to perform similarity between text strings. In the following code, the two input strings are vectorized and the similarity is returned as a floating point value between 0 and 1.

June 20, 2012
Multidimensional Scaling

Multidimensional Scaling (MDS) is a linear embedding method used when we only know the pairwise distances between data points. For linear systems, MDS works well with as little as 10 points and the system is 2 dimensional.

April 29, 2012
Rewiring the RSS icon link for Platform

Step-by-step instructions for rewiring where your RSS link icon points to within the Platform theme (by PageLines) for Wordpress (Updated 2012-06-21)

September 8, 2011
Estimating Lyapunov Spectra of ODEs using Python

Python code is shown that estimates the Lyapunov spectra for the Rossler and Lorenz systems. This code is written in a way that makes it adaptable for other continuous-time systems.

September 3, 2011
Modelling Chaotic Systems using Support Vector Regression and Python

Support Vector Regression is a technique in machine learning that can be used to model chaotic data. A program is shown to work on Delayed Henon Map data.

August 17, 2011
Automatically Link Text using VB.Net

Automatically add HTML to link any words with http:// or https:// within text using this VB.net script

June 1, 2011
Generating Poincaré Sections and Return Maps

Using the iterative 4-th order Runge-Kutta method as described here, we can create low dimensional slices of the system’s attractor known as Poincare Sections, Return maps, or Recurrence maps. We will use the Rossler attractor for this example, with a, b, and c set to 0.2, 0.2, and 5.7, respectively. Poincare sections are important for visualizing…

May 25, 2011
Generating time series for Ordinary Differential Equations

We can produce a time series from ordinary differential equations by solving the equations using the iterative 4-th order Runge-Kutta method and plugging each of the solutions back into the equations.

May 12, 2011