title: Choose frequency of x axis labels in boxplot r
body: <p>I am trying to make a boxplot of quite a large database to illustrate the temperature span (weather variability) per day of the year:</p>
  
  <pre><code>boxplot(Datasubset$Temp~Datasubset$Day,las=2,data=Datasubset,main="Weather Variability",xlab=names(Datasubset)[1],ylab=names(Datasubset)[3])
  </code></pre>
  
  <p>The Datasubset data frame looks like this:</p>
  
  <pre><code>Day Hour Temp
  1/1/2015 1 3
  2/1/2015 2 4
  [...] [...] [...]
  31/12/2015 8760 2
  </code></pre>
  
  <p>However, my x axis show too many values which means they overlap and become unreadable. Would it be possible to regulate the frequency of the x axis labels? For example, only show a label every 10 or 20 days?</p>
  
  <p>Also, my xlab and ylab commands seem a bit artificial. Is it possible to reference to the name of the column in the data frame in a more natural way?</p>
  
  <p>These are probably simple things but I couldn't seem to find answers in ?boxplot. </p>
  
  <p>Thank you in advance. </p>