title: how to control the display of values on Y axis?
body: <p>I have several files that I need to plot but I noticed that with each plot Y axis is different(the values for all file are close to each other). I want the plot to display the values on y axis the same thing for all files.</p>
  
  <p>example </p>
  
  <p>if you plot f here you would get two ticks 100 and 300 only on y axis</p>
  
  <pre><code>f=c(1:477)
  
  plot(f)
  </code></pre>
  
  <p>How can I tell R to display some thing like 100 200 300 400 not only 100 and 300 on Y axis</p>