Aleph Null | Open Source Technology and Mathematics

How to print from iPad to Ubuntu 14.04

Ben Linsey-Bloom - Aug 30, 2014 - 3:39pm

My past self would be sad and amazed if he could see me how lazy I’ve become. I have a printer plugged into my laptop which runs on Xubuntu but I wanted to be able to print from my iPad while I’m on the sofa downstairs.

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Fix battery issues on HTC Desire 601 since software update 4.4.2

Ben Linsey-Bloom - Aug 29, 2014 - 10:07am

I’ve had an HTC Desire 601 for a few months now and have generally been very happy with it. Generally the battery has lasted about 30 hours with minimal use, but last week HTC released a software update which meant battery the battery life went to about 6 hours without me even using it!

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Monitoring a Windows machine via Nagios

Josh Palmer - May 28, 2014 - 5:03pm

In this post, I detail how to setup Nagios to monitor a Windows machine via NSClient++

Prerequisites:

A working Nagios install, configured on a server with a fixed IP
The latest NSClient++ MSI Installer

NOTE: At time of writing, the latest version of NSClient++ is 0.42 and is recommended as 0.41 has issues with binding to IPv4 addresses

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Compiling mixed Sage and Python code with Cython

Pete Donnell - May 14, 2014 - 4:26pm

At the moment I’m working on some maths code written in a combination of standard Python and its mathematical superset, Sage. The code is fairly computationally expensive (it’s essentially a brute force search for chemical reaction networks that are monotone). Consequently, after getting the code working as a proof-of-concept, I wanted to compile it to C using Cython to get a bit more speed out of it. I found the documentation on converting Sage and Python scripts to Cython a bit vague, particularly when it comes to combining the two, so this article gives step by step instructions based on my findings.

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Presentation on mozjpeg

Ben Linsey-Bloom - Apr 28, 2014 - 4:42pm

I just gave a presentation on Mozilla's new JPEG-improving project mozjpeg as part of my 'image technology' module at university. We had to chose an emerging technology to research and present to the class in pairs.

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Upgrading Moodle to a newer branch using git

Pete Donnell - Mar 13, 2014 - 6:45pm

In this post, I describe how to upgrade a Moodle installation from one major version to a newer one using the command line and git.

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Maxima function to calculate the second additive compound of a square symbolic matrix

Pete Donnell - Mar 06, 2014 - 1:25pm

In this post, I present a function to calculate the second additive compound of a square matrix using the symbolic algebra program Maxima.

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Installing Ubuntu 12.04 LTS on a Dell Windows 8 machine with UEFI

Joe Parker - Mar 01, 2014 - 1:14pm

Enticing a Windows 8 installation to dual-boot happily alongside Ubuntu on a UEFI-enabled Dell machine

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Introducing CoNtRol: an open source web application for analysing Chemical Reaction Networks

Pete Donnell - Feb 24, 2014 - 7:45pm

I’m very excited to announce the public release of CoNtRol, a web application designed to carry out mathematical analysis of chemical reaction networks. A formal introduction has been accepted for publication in Bioinformatics, and technical documentation is available on the reaction networks wiki. In this article I want to talk a bit about the design philosophy behind CoNtRol.

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Migrating a Drupal site from a single site to multi-site install

Pete Donnell - Nov 20, 2013 - 8:03pm

In this post, I describe how to move a Drupal based website from a single site installation to a multi-site installation. The instructions are centred on Debian/Ubuntu, but should be easy to adapt to other setups.

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