title: Sparse Matrix Libraries for Ruby
body: <p>I'm looking for a Sparse Matrix library I can use from Ruby. I'm currently using the <a href="http://rb-gsl.rubyforge.org/" rel="noreferrer">GNU Scientific Library bindings</a> provided by the "gsl" gem, but my application would be better optimized if I used a dedicated sparse matrix library. I've investigated the <a href="http://rubyforge.org/projects/linalg/" rel="noreferrer">linalg</a> and <a href="http://narray.rubyforge.org/" rel="noreferrer">NArray</a> libraries. None of the these three libraries support sparse-matrix optimised storage or operations.</p>
  
  <p>Is there anything out there I've missed - or an existing C library that may be possible to write bindings for? I'd prefer the former to that latter, as I haven't written C bindings in Ruby before, but I would be willing to attempt it. </p>