GNU Octave uses the Matlab language, though not all the libraries that are available for Matlab are avaialble for GNU Octave. This does not prevent you from coding these functions up yourself. The GNU Octave team has a reporting method that allows you to report if a function does not work the same as it does in Matlab.
GNU Octave is also uses the interpreted method. Both Python and C# are interpreted, but I am not sure about R. I know of it, but I have not used it.
Replay available now: A handful of emerging network technologies are competing to be the preferred wide-area connection for the Internet of Things. All claim lower costs and power use than cellular but none have wide deployment yet. Listen in as proponents of leading contenders make their case to be the metro or national IoT network of the future. Rick Merritt, EE Times Silicon Valley Bureau Chief, moderators this discussion. Join in and ask his guests questions.