I noticed that the wikipedia entry for this http://en.wikipedia.org/wiki/Comparison_of_numerical_analysis_software does not mention the J language, though others, like Matlab, Octave, R, Sage, Maple and Mathemetica are listed, along with more specialized stuff. Scilab looked interesting too, hadn't seen it before.
Does anyone think J would not fit easily in there? (Not enough ready-made packages, or whatever...?) Is there a Wikipedia editor in the room? ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
