title: hist() - how to force equal bins width?
body: <p>Assuming I have the following array: <code>[1,1,1,2,2,40,60,70,75,80,85,87,95]</code> and I want to create a histogram out of it based on the following bins - <code>x&lt;=2</code>, <code>[3&lt;=x&lt;=80]</code>, <code>[x&gt;=81]</code>.</p>
  
  <p>If I do the following: <code>arr.hist(bins=(0,2,80,100))</code> I get the bins to be at different widths (based on their x range). I want them to represent different size ranges but appear in the histogram at the same width. Is it possible in an elegant way?</p>
  
  <p>I can think of adding a new column for this (holding the bin id that will be calculated based on the boundaries I want) but don't really like this solution..</p>
  
  <p>Thanks!</p>