The subject line is from http://www.math.utah.edu/lab/ms/matlab/matlab.html I've seen little use of the words "matrix" or "vector" in the numarray stuff. These are one or two dimensional structures. The Numeric/numarray focus is on multidimensional arrays. Some years ago, Huaiyu Zhu made a number of postings advocating the introduction of a Python-based system permitting the usual matrix operations. It seems that the culmination of these efforts was Matpy (http://matpy.sourceforge.net/), which is not currently active. I was impressed with the case made by Huaiyu Zhu and have attempted to carry on in this direction. An outline of this work is at: http://www3.sympatico.ca/cjw/IntroToPyMatrix.pdf. This work was based on numarray, partly because it was generally considered to be the way ahead and partly because it purported to provide a class structure. numarray has proved to be a bit of a moving target. I am continuing this work in the hope that some class-based structures will come out of the current Numeric3 discussions. The hope is also that there is a need out there for matrix operations, as distinct from array operations. Colin W.