title: how to plot two-dimension array in python?
body: <p>I have dataset with </p>
  
  <pre><code>data = [[1,2,3], [4,5,6], [7,8,9]].
  </code></pre>
  
  <p>and call</p>
  
  <pre><code>plot(data)
  plot.show()
  </code></pre>
  
  <p>then y-axis is treated as inner array's value.</p>
  
  <p>what I want is</p>
  
  <pre><code>f(0,0) = 1, f(0,1) = 2, f(1,2) = 3, 
  f(1,0) = 4, f(1,1) = 5, f(1,2) = 6,
  f(2,0) = 7, f(2,1) = 8, f(2,2) = 9
  </code></pre>
  
  <p>The question is, how to change y-axis to array's index instead of array's value?</p>