Older articles (4/26)

1. Patching CalculiX Graphics to fix flipped screen hardcopy

   Since some time, I’ve had the problem that generating hardcopy images from cgx doesn’t work properly; the pictures are inverted vertically.

   At first, I thought this might have been a change in cgx. But comparing the source code for cgx.c for 2.16 up to and including 2.19, I don’t see anything that would explain it.

2. Examining an OpenSSH ECDSA public key

   Intrigued by this question, I investigated the structure of an OpenSSH ECDSA public key.

3. Python & standard output redirection on ms-windows

   Redirecting standard output of the Python script on ms-windows can cause strange crashes because of encoding differences.

4. Profiling Python scripts (5): ent_without_numpy

   This is the fifth in a series of articles that covers analyzing and improving performance bottlenecks in Python scripts. The program ent_without_numpy.py is a lot slower than the version that uses numpy. The performance of ent_without_numpy.py is the topic of this article.

5. Profiling Python scripts (4): vecops.indexate

   This is the fourth in a series of articles that covers analyzing and improving performance bottlenecks in Python scripts. The performance of stl2ps is the topic of this article.

6. Profiling Python scripts (3): stl2ps

   This is the third in a series of articles that covers analyzing and improving performance bottlenecks in Python scripts. The performance of stl2ps is the topic of this article.

7. Profiling Python scripts (2): stlinfo

   This is the second in a series of articles that covers analyzing and improving performance bottlenecks in Python scripts. In this second article the performance of stlinfo is looked at.

8. Profiling Python scripts (1): stl2pov

   This is the first in a series of articles that covers analyzing and improving performance bottlenecks in Python scripts.

9. Simple setup.py for python scripts

   Installing Python scripts (as opposed to modules) is a too involved using distutils/setuptools. Those do not take into account zipped archives and scripts using a GUI toolkit. The latter is a problem on ms-windows.

   So I wrote my own setup scripts to do things differently;

   • A simple setup script that works on single-file scripts.
   • A setup script that can wrap applications plus their custom module up in a zip-file and install it as a single self-contained file.
   • They should work on POSIX and ms-windows without root/administrator privileges.
   • And they should not require anything outside the python standard library.

   These scripts are now available on github as setup-py-script.

10. Merging local git repositories

    For a long time, I’ve had a directory ~/templates to store template files for several programs.

    For historical reasons, my LaTeX templates have been stored under ~/latex/templates.

    Both have been under git revision control since 2006; before that I used rcs.

    I want to merge both local repositories under ~/templates. This articla documents how that was done.