title: How to sum two matrices in Scala?
body: <p>Suppose I define type <code>Matrix</code> as <code>Vector[Vector[Int]]</code> and sum two matrices like this:</p>
  
  <pre><code>type Matrix = Vector[Vector[Int]]
  
  val addup: (Matrix, Matrix) =&gt; Matrix = (_, _).zipped map ((_, _).zipped map (_ + _))
  </code></pre>
  
  <p>Is there a library, which provides a generic <code>zipped map</code> so I can simplify <code>addup</code> ? </p>