title: tick frequency when using seaborn/matplotlib boxplot
body: <p>I am plotting with seaborn a series of boxplots with</p>
  
  <pre><code>sns.boxplot(full_array)
  </code></pre>
  
  <p>where <code>full_array</code> contains 200 arrays. 
  Therefore, I have 200 boxplots and ticks on the x-axis from 0 to 200.</p>
  
  <p>The xticks are too close to each other and I would like to show only some of them, for instance, a labeled xtick every 20, or so.</p>
  
  <p>I tried several solutions as those mentioned <a href="https://stackoverflow.com/questions/12608788/changing-the-tick-frequency-on-x-or-y-axis-in-matplotlib">here</a> but they did not work.</p>
  
  <p>Every time I sample the xticks, I get wrong labels for the ticks, as they get numbered from 0 to N, with unit spacing.</p>
  
  <p>For instance, with the line <code>ax.xaxis.set_major_locator(ticker.MultipleLocator(20))
  </code> I get a labelled xtick every 20 but the labels are 1, 2, 3, 4 instead of 20, 40, 60, 80...</p>
  
  <p>Thanks to anyone who's so kind to help.</p>