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PDL (2.4.2) *****

This is an extremely powerful & versatile language, but you do have to be reasonably familiar with Perl to be able to really take advantage of it. One feature that I find particularly useful is that the developers have made it quite easy to extend it with your own c sub-routines (see PDL::PP). This gives you the best of both worlds, a high level scripting language, with many built-in functions, for ease of idea developement and a compiled language that quickly handles any customized processor intensive stuff.