title: Does Mat in hls:Mat really represents a matrix?
body: <p>I am working on Vivado HLS. I am reading an image via stream and storing it in <code>hls:mat</code>. I want to perform an element-wise operation on this <code>mat</code>. Does mat really represent a matrix? Is there a way in which I can access it like a Matrix i.e. <code>A[rows][columns]</code>?</p>
  
  <p>Method <code>A.at&lt;double&gt;(0,0)</code> is not working.</p>