I’m using Octave for a machine learning course I’m taking online. It’s an open source MatLab clone, and true to open source it is ugly, awkward, and doesn’t install easily. Of course it’s also great free software that I’m grateful for, but that doesn’t make it easier to install.
There’s a binary version of Octave 3.8.0 that is an official installer. But the command line interface doesn’t seem able to plot graphics of any kind. The GUI version can, but there’s so many other bugs in the GUI I want the command line to work. Specifically for a program like this to run:
t = [0:0.2:2*pi]; y=sin(t); plot(t,y);
Homebrew has a formula for Octave 3.8.2 with a zillion dependencies and options. In theory “brew install octave” should work but in practice it’s not sufficient. Here’s something approximating what worked for me, based mostly on these notes
- brew install Caskroom/cask/aquaterm
Some funky graphics system that allows plots to be drawn without X11
- brew install gnuplot –with-x11 –with-aquaterm
Install GNUPlot using various graphics systems. The octave formula doesn’t seem to select these reliably.
- brew install octave –without-docs –without-gui –without-java
Building the docs induces TeX to be installed. No thanks. I have no idea what optional Java things Octave depends on but I’d rather not bother. And I don’t want the experimental GUI, so skip that too.
- brew link –overwrite gcc
Octave’s formula is designed to be built with gcc and gcc’s Fortran. It installs gcc (which takes over an hour to compile!) but I had a different version of gfortran installed previously, which caused my Octave build to fail. The –overwrite causes the gcc package to override gfortran.
- brew install ghostscript
I had to run this three times by hand because the download server was broken.
This took about 3 hours total. Once completed, my simple 2 line plot program works. Yay!
One added complication; you can select different graphics systems in Octave at runtime. The brew info even helpfully tells you how:
setenv('GNUTERM','qt') # Default graphics terminal with Octave GUI setenv('GNUTERM','x11') # Requires XQuartz; install gnuplot --with-x setenv('GNUTERM','wxt') # wxWidgets/pango; install gnuplot --wx setenv('GNUTERM','aqua') # Requires AquaTerm; install gnuplot --with-aquaterm
If I don’t set this at all, I seem to be getting aqua. And it works. I can also use the x11 graphics system and it works as well.
That IPython web browser integration sure looks like a smart idea now doesn’t it?