Proposal for the Jad matrix format

[feel]

Hi everybody,

I implemented a version of CUSP with JAD format to store the matrix. I noticed that
it's possible to improve significatly the performance for a lot of sparse matrices structures.

I attach the main file here and the improvement is also available in http://github.com/fsquillace/cusp.



Best,
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Filippo Squillace
Affiliate Researcher to
Lawrence Berkeley National Laboratory
One Cyclotron Road
Berkeley, CA 94720
Tel: (510) 610-5324
Website: http://filipposquillace.alwaysdata.com/
LinkedIn: http://www.linkedin.com/in/filipposquillace
Github: https://github.com/fsquillace
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