title: Share one y axis for four different boxplots
body: <p>I work with the iris dataset, the aim is to get 4 boxplots next to each other and make them all share an y-axis that goes from 0 to 8</p>
  <pre><code>par(mfrow=c(1,4))
  boxplot(iris$Sepal.Length, width = 3)
  boxplot(iris$Sepal.Width, width = 3)
  boxplot(iris$Petal.Length, width = 3)
  boxplot(iris$Petal.Width, width = 3)
  </code></pre>
  <p>I have the 4 plots next to each other now but they all have their own y-axis, suited to their own min and max.</p>
  <p>How can i make them share a y-axis?
  I also want to have a x-axis where I can label them with &quot;Sepal.Length&quot;, &quot;Sepal.Width&quot; and so on.</p>
  <p>Solutions without the ggplot if possible, thanks.</p>