As perOctave website, "Octave is a high-level language, primarily intended for numerical computations. It provides a convenient command line interface for solving linear and nonlinear problems numerically, and for performing other numerical experiments using a language that is mostly compatible with Matlab. It may also be used as a batch-oriented language."
The purpose of this collection of tutorials is to get you through most (and eventually all) of the available Octave functionality from a basic level.
A longer and more advanced Wikibook related to Octave Programming is theMATLAB Programming Wikibook. Those familiar with MATLAB that want to jump into Octave should consultMATLAB Programming/Differences between Octave and MATLAB.
Indeed, Octave is often viewed as a system for numerical computations with a language that is mostly compatible with Matlab, but that is available as free software under the GNU GPL, and that can replace it in many circumstances. This is why only one advanced programming Wikibook is being written; but therein the differences between MATLAB and Octave languages are presented.
 | Aprintable version of Octave Programming Tutorial is available. (edit it) |
Available tutorials for beginners:
Available tutorials that are more advanced: