title: Plotting a motion field with quiver in MATLAB
body: <p>I am trying to use a quiver plot for the first time. I have a matrix uv(2x251x251) with an uv vector associated to x and y coordinates. When I try to use </p>
  
  <pre><code>quiver(uv(1,:,:),uv(2,:,:))
  </code></pre>
  
  <p>I do not see anything, no points or arrows. When I try to plot just one vector for just one point with</p>
  
  <pre><code>quiver(uv(1,1,1),uv(2,1,1))
  </code></pre>
  
  <p>the arrow shows up and I can see it. My u and v values range from -1 to 1. I don't get why I can see something when I plot one vector but not when I try to plot all of them.</p>