GNU Octave is a scientific programming language which is an open-source version of Matlab. It supports multiple operation systems: Linux, Windows, MAC, and BSD. I use Octave as a Matlab alternative.
Octave Forge is a repository of Octave packages: 68 maintained and 33 unmaintained packages (as of Dec. 18, 2017). The packages (of my interest) include geometry, linear algebra, statistics, GNU scientific library, (stochastic concept & maximum entropy for) time series analysis, time/frequency analysis, data smoothing, econometrics (including MLE & GMM), signal processing, image processing (image acquisition), audio processing (unmaintained), communications, control, multivariate normal distribution clustering, statistics & machine learning toolbox for missing values, non-linear optimization, fuzzy logic, genetic algorithm, ann (unmaintained) and feed forward neural network (unmaintained).
Installing a package is easy and the package manual is well-documented.
“>> pkg install -forge package_name” installs a package. For example,
“>> pkg install -forge linear-algebra” installs the linear-algebra package.
“>> pkg load package_name” load a package for usage. For example,
“>> pkg load linear-algebra” prepares the linear-algebra package.
To list all installed packages,
>> pkg list
Package Name | Version | Installation directory
audio *| 1.1.4 | /home/user_name/octave/audio-1.1.4
control | 3.0.0 | /home/user_name/octave/control-3.0.0
linear-algebra *| 2.2.2 | /home/user_name/octave/linear-algebra-2.2.2
signal | 1.3.2 | /home/user_name/octave/signal-1.3.2