title: How can I adjust the dimension of the axes fviz_pca
body: <p>I'm trying to put the two axes of my biplot exactly equally scaled (i.e., 1 cm on the vertical axis must represent the same 1 cm on the horizontal axis). How can I do that with fviz_pca? or there is some better pca package?</p>
  
  <p><strong>My code</strong></p>
  
  <pre><code>fviz_pca_ind(res.pca,
           col.ind = groups, # color by groups
           palette = c("#00AFBB",  "#FC4E07"),
           addEllipses = TRUE, # Concentration ellipses
           ellipse.type = "convex",
           legend.title = "Groups",
           repel = T, ggtheme=theme(axis.text=element_text(size=16), axis.title=element_text(size=16)))
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/TRqex.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/TRqex.png" alt="PCA fviz_pca_ind"></a></p>