The MathWorks, Inc. [http://www.mathworks.com/] styles MATLAB [http://www.mathworks.com/products/] as "the language of technical computing". [TCL-MAT] "GNU Octave is a high-level language, primarily intended for numerical computations", according to its home page [http://www.octave.org]. Its language "is mostly compatible with Matlab." http://merlin.inescn.pt/~qual/tk_octave/index.htm ? Tkoctave [NAP] [[Link to article on Open Source vs. proprietary for scientists.]]