title: Replace X-axis with own values
body: <p>I have a question regarding the command plot().</p>
  
  <p>Is there a way to fully eliminate the x-axis and replace it with own values? I know that I can get rid of the axis by doing</p>
  
  <pre><code>plot(x,y, xaxt = 'n')
  </code></pre>
  
  <p>and then add an axis with</p>
  
  <pre><code>axis(side = 1 etc.)
  </code></pre>
  
  <p>However, when I add the axis, obviously it still refers to the data plotted as 'x'. 
  I would only like to plot the 'y'-values and add the x-axis my own in the sense of just "drawing" the x-axis with own values specified. Is there any way to do that?</p>
  
  <p>The background of this question is that my two data frames differ in their length and therefore I cannot plot them.</p>