title: Plot two histograms on single chart with matplotlib
body: <p>I created a histogram plot using data from a file and no problem. Now I wanted to superpose data from another file in the same histogram, so I do something like this</p>
  
  <pre><code>n,bins,patchs = ax.hist(mydata1,100)
  n,bins,patchs = ax.hist(mydata2,100)
  </code></pre>
  
  <p>but the problem is that for each interval, only the bar with the highest value appears, and the other is hidden. I wonder how could I plot both histograms at the same time with different colors.</p>