Dear interested potential reviewer,

Recently we've (hopefully finished) making a patch switching RDF and CDF 
matrices to a numpy-based backend (i.e., the matrices are internally 
numpy matrices, instead of the previous GSL matrices).  Basically, this 
makes most RDF or CDF matrix operations faster and also taps into a 
vibrant community surrounding the numpy and scipy scientific python 
communities.  There are also other issues about us not being able to 
include updates to GSL because of licensing, whereas we have a clear 
upgrade path with numpy/scipy.

The patches are up at http://trac.sagemath.org/sage_trac/ticket/3498. 
If you are interested, it'd be great if you could review these.  See the 
extensive notes on the ticket, which include timing tests, for details 
about the patches.  There have been some reviews of the patches up to 
this point, but it'd be great if someone could review the current set of 
patches that is up there now.

These patches also factor out almost all of the duplicated functionality 
in the two classes, so the code should be much smaller as well.

Thanks,

Jason


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