title: r barplot ylab is horizontal instead of vertical
body: <p>I'm trying to plot a barplot for errors, but my ylab is horizontal and I want to be vertical in the left of the plot.</p>
  
  <pre><code>errors=c(7.338711e-07,1.399190e-03,1.666794e-04,2.513632e-04,
         1.888479e-04,1.394840e-03,6.682082e-03,6.471887e-05,
         7.800729e-05,2.087988e-04,3.150596e-03,5.698861e-04,
         5.961718e-04,2.681394e-05,3.202360e-05,3.912834e-04,
         4.910918e-05,6.131810e-05,1.184472e-03,6.525520e-04,
         3.543068e-05,1.816346e-04,1.717658e-04,2.370331e-05,
         8.101786e-05,1.013240e-05,1.511531e-03,3.026940e-04,
         7.963667e-04,5.409863e-04)
  
  ages=60:89
  
  barplot(t(errors),horiz=TRUE,las=2,beside=TRUE,col='orange',xlab="error",ylab=ages)
  </code></pre>
  
  <p>Thank you for your help</p>
  
  <p>The resulting plot is 
  <a href="https://i.stack.imgur.com/Osdpp.png" rel="nofollow noreferrer">enter image description here</a></p>