title: How to remove certain values before plotting data
body: <p>I'm using python for the first time. I have a csv file with a few columns of data: location, height, density, day etc... I am plotting height (i_h100) v density (i_cd) and have managed to constrain the height to values below 50 with the code below. I now want to constrain the values on the y axis to be within a certain 'day' range say (85-260). I can't work out how to do this.</p>
  
  <pre><code>import pandas 
  import matplotlib.pyplot as plt
  
  data=pandas.read_csv('data.csv')
  data.plot(kind='scatter',x='i_h100',y='i_cd')
  plt.xlim(right=50)
  </code></pre>