title: Armadillo - how to create Matrix from sparse format?
body: <p>Let's say I have a sparse matrix.  I have it defined in the following CSV format:</p>
  
  <p><code>row,column,value
  1,1,5
  1,2,10
  </code></p>
  
  <p>In this case, the point (1,1) is equal to 5 and the point (1,2) is equal to 10.</p>
  
  <p>What is an efficient way to create a matrix from this format (assuming thousands or hundreds of thousands of rows)?</p>
  
  <p>In other words, I want the equivalent of running full(spconvert(m)) in Matlab, where m is the above matrix.</p>