title: Plotting a 2d Array with mplot3d
body: <p>I have a 2D numpy array and I want to plot it in 3D. I heard about mplot3d but I cant get to work properly</p>
  
  <p>Here's an example of what I want to do. I have an array with the dimensions (256,1024). It should plot a 3D graph where the x axis is from 0 to 256 the y axis from 0 to 1024 and the z axis of the graph displays the value of of the array at each entry.</p>
  
  <p>How do I go about this?</p>