Roland's homepage

My random knot in the Web


This is my home in the virtual world, where I write about things that I want to share. The freely available software that I've written as well as some of the photographs I've taken over the years can also be found here. Please use the navigation links on the right if you are looking for something.

Recent articles

  1. Making a subset of a git repository

    Since I am in the process of making most of my programs available on github, I have been re-shuffling the some git repositories. Especially my collection of scripts (small programs for different purposes). Because some of those scripts are private, I don't want to publish that repository as a whole.

  2. Writing the README first

    Today I watched Kenneth Reitz's python for humans video. His statement that “API is all that matters” resonated with me because I sometimes struggle with that.

    Then he mentioned that you should write the README first, before writing any code. This is something that I do sometimes, but not always thoroughly. So I decided to use this as an experiment to refactor my beammech module.

  3. Updating FreeBSD from source

    Sometimes I need to update my FreeBSD operating system. I prefer to do that from the source code, so that my customizations in (/etc/src.conf) remain.

    At the writing of this article, I'm tracking the 10-STABLE branch. To start this, I removed the contents of /usr/src and ...

  4. Switching IPython to Python 3

    More and more, IPython has become my tool of choice as the ultimate calculator and to try out concepts and code for use in my programs.

    While I generally use the terminal-based interactive shell, notebooks offer more capabilities for integrating text, formulas and graphics.

    With Python 2.7 effectively mostly ...

  5. Making saline solution

    The standard recipe for saline solution is 9 grams of salt per liter of water.

    Since most people don't have an accurate scale, we need to convert the nine grams to a volume. For that we need the bulk density of table salt. For fine table salt, the listed ...

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