Announcing exiftool.el
Mar 02, 2017
This is to announce the release of exiftool.el, an emacs lisp wrapper around ExifTool. ExifTool is a command line application supporting reading and writing metadata in various formats including EXIF, XMP and IPTC.
Tags: software, project, freesoftware
Black body energy as a sum of photon oscillator energies
Nov 01, 2016
This is a graph I made for contributing to Wikipedia. It shows the energy of a black body as the sum of energies from oscillators with 1 photon, 2 photons, 3 photons, etc.
User script to remove noscript mask on ebay
Aug 30, 2016
A greasemonkey user script that removes the noscript mask on ebay and lets the user browse ebay without enabling javascript…
Tags: javascript, software, greasemonkey
Elegant bash one liner to generate passphrase
Jul 27, 2016
An elegant bash one liner to generate a passphrase – shuf from coreutils is the secret ingredient.
A simple passphrase generator in bash
Jul 20, 2016
Yet another passphrase generator, this time one in bash…
NASA Astronomy Picture of the Day bot for GNU Social
Jun 11, 2016
A bash script, run periodically by a cron job, to post the day's NASA Astronomy Picture of the Day to GNU Social. The script uses GNU Social's Twitter compatible API to publish notices.
fold and stream-fold pass arguments to proc in different orders
Mar 24, 2016
SRFI-1 fold and SRFI-41 stream-fold pass arguments to proc in different orders. Violating the principle of least astonishment, this comes as a rather inconvenient surprise to the programmer.
Tags: lisp, scheme, functionalprogramming, software
Fourier Reconstruction of an Image
Dec 11, 2014
Any image can be reconstructed using just a superposition of plane waves of different spatial frequencies. This is a numerical experiment using a NumPy script that reconstructs an image one frequency component at a time.
Line Codes - Matlab / GNU Octave Code
Jul 19, 2012
I came up with the following approach to do line coding without for loops. My approach involves a bit of system theory, modulo 2 arithmetic, and sometimes just tricks founded on simple coincidence. So one is advised to be a little careful while sifting through the logic. But ultimately, the code is terse and fairly elegant.
Stochastic Simulation
Mar 17, 2012
This is a loose collection of programs we wrote as part of a course on "Stochastic Models" we had in the fourth semester of college. This includes a couple of pseudo random number generators (the Von Neumann middle square PRNG and the linear congruential generator PRNG), an implementation of the Monte Carlo method to determine area of an arbitrarily shaped figure and a simple simulation of birth-death process.
Resistor Color Codes Script
Mar 17, 2012
I just decided to write a Python script to convert resistor color codes to resistance values. Later, I also wrote a script to do the reverse - namely to find the color code of a given resistor.
Tags: electronics, python, software, project
Signal Operations Applet
Mar 17, 2012
This is actually a set of two "applets" we did as part of an assignment for "Signals and Systems" in the fourth semester of college. The goal was to write an application which illustrated basic signal operations such as shifting, scaling, folding and also signal addition and multiplication. This series regulated power supply provides an output voltage of about 5.3 V and a maximum current of almost 500 mA. As can be seen from the VI curve of the power supply, the quality of regulation isn't awesome. Still, I guess, acceptable for a first attempt…
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