Perhaps this is best left to Greg Ward, but I just thought that I'd point out to the list that Pyrex <http://www.cosc.canterbury.ac.nz/~greg/python/Pyrex/> in the latest version 0.4.1 successfully interfaces with the (original) Numeric array data types. There are examples in both the Demo subdirectory and in the website's FAQ. Another alternative for getting performance, interfacing to C libraries, and even calling Fortran (from Pyrex's Python/C hybrid code). Frank (Choice is Good ;-) Horowitz