title: Can one define a one dimensional image inline?
body: <p>I would like to describe a very simple image (really a vector) of length 2, like <code>(1,2)</code> for the purpose of some linear algebra. 
  The following creates a two dimensional image with a y axis of length 1:</p>
  
  <pre class="lang-c prettyprint-override"><code>image a := [2,1]: {
      {1, 2}
  }
  MatrixPrint(a)
  </code></pre>
  
  <p>This outputs</p>
  
  <pre><code>{
  {1, 2}
  }
  </code></pre>
  
  <p>How would I in a similar fashion output this instead?</p>
  
  <pre><code>{123,45}
  </code></pre>
  
  <p>Additionally, if I had image of arbitrary shape <code>(a, b)</code>, how can I slice it to extract a one dimensional image at a value <code>n</code>, either along the x or y axes? (Extracting a line profile along one of the image axes)</p>