How much effort do you already have invested in Ruby?  People have
been working hard on scientific python for 10 years (scipy, numpy,
matplotlib,
vtk python interfaces, weave, f2py).  In the arena of scientific
computing, my guess
is Ruby is about 3 years behind, maybe more, just in terms of how long
it would take to
produce reasonably full featured, bug-vetted libraries with a broad
user base comparable to what python already has.

Does Ruby offer you such great advantages over python that you are
willing to sacrifice mature
tools with widespread community involvement for these advantages?  And
if so, what are they?



JDH