title: A hierarchical clustering in php or javascript
body: <p>I'm currently working on a project in bioinformatics where drugs will be analyzed and results should be grouped according to similarity patterns.</p>
  
  <p>For this, I use algorithms such as Euclidean distance and Mahalanobis distance. I'm currently using the library <a href="http://harthur.github.com/clusterfck/" rel="nofollow">Clusterfck</a> but that is very limited and generates information completely out of default.</p>
  
  <p>I wonder if there are other libraries in JavaScript or PHP that have implemented these calculations.</p>