title: How to set X axis range on plotly graphs?
body: <p>I am using R version of plotly. Here is what I want:</p>
  
  <pre><code>x = 1:100
  y = 1:100
  plot_ly(x, y)
  </code></pre>
  
  <p>I want the graph only show where x>20 and x&lt;40, ignoring the other part. How to do this ?</p>