title: Set axis limits for plot.PCA - strange behaviour (FactoMineR)
body: <p>I want to plot the result of a PCA with the package factominer. When one plots a PCA it is good practice to resize the graph so that its H/L ratio is in proportion to the %variance explained by each axis.</p>
  
  <p>So I tried first to resize the graph simply by stretching the window: it obviously fails and keep the points in the middle <strong>instead of stretching them too.</strong></p>
  
  <pre><code>library(FactoMineR)
  out &lt;- PCA(mtcars)
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/PGmTn.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/PGmTn.png" alt="enter image description here"></a></p>
  
  <p>Then I try to force the <code>xlim</code> and <code>ylim</code> arguments to be fixed (<code>?plot.PCA</code>)</p>
  
  <pre><code>plot.PCA(out, choix="ind", xlim=c(-6,6), ylim=c(-4, 4))
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/wjfJ2.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/wjfJ2.png" alt="enter image description here"></a></p>
  
  <p>Same problem, the xlim limits are not respected...</p>
  
  <p>Can someone explain this behaviour and knows how to fix it? </p>