title: Cross Product in Julia
body: <p>Consider the <code>Matrix</code></p>
  <pre><code>A = [1., 2., 3.; 4., 5., 6]
  </code></pre>
  <p>and the <code>Vector</code></p>
  <pre><code>v = [0.1, 0.2, 0.4]
  </code></pre>
  <p>What is the most efficient &quot;Julianic&quot; way to obtain a new <code>Matrix</code> whose rows are <code>[cross(A[1, :], v); cross([2, :], v)]</code> ? The result for the numbers above should be <code>[0.2, -0.1, 0.; 0.8, -0.1, 0.3]</code></p>
  <p>How to generalize for N rows in A?</p>